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data-name=\"product-description\" data-source=\"Rendered by Builder.io\"\u003e\u003cdiv class=\"builder-content\" builder-content-id=\"92568ae5e5c94f66ad459686049f1bc7\" builder-model=\"product-description\"\u003e\u003cdiv data-builder-component=\"product-description\" data-builder-content-id=\"92568ae5e5c94f66ad459686049f1bc7\" data-builder-variation-id=\"92568ae5e5c94f66ad459686049f1bc7\"\u003e\n\u003cstyle data-emotion-css=\"h47494\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-blocks css-h47494\" builder-type=\"blocks\"\u003e\n\u003cstyle data-emotion-css=\"hll6ih\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-block builder-6557998020054304b57b9498b81f9b84 css-hll6ih\" builder-id=\"builder-6557998020054304b57b9498b81f9b84\"\u003e\n\u003cstyle data-emotion-css=\"hgfgng\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-block builder-3ac68894030949a893a9bb67c66dc2f5 builder-has-component css-hgfgng\" builder-id=\"builder-3ac68894030949a893a9bb67c66dc2f5\"\u003e\n\u003cstyle data-emotion-css=\"1qggkls\"\u003e\u003c\/style\u003e\n\u003cspan class=\"builder-text css-1qggkls\"\u003e\u003ch3\u003eReimagine Analog Sound, A\u0026amp;ultima SP4000T\u003c\/h3\u003e\n\u003cp\u003eA\u0026amp;ultima SP4000T is the culmination of nearly two years of dedication and exploration, beginning from the planning and development stages of SP3000T.\u003c\/p\u003e\n\u003cp\u003eDAC, Tube, and AMP — the essential elements of high-end audio — may be accessible to anyone. Yet even with the same elements, what is ultimately created from them is an entirely different matter. Using the canvas of SP4000, the essence of digital sound, Astell\u0026amp;Kern held onto one defining question over the past two years:\u003c\/p\u003e\n\u003cp\u003e“How can we bring deeper emotion through analog sound?”\u003c\/p\u003e\n\u003cp\u003eThe answer was drawn with sincerity and endless passion, stroke by stroke. Every trace of that journey is distilled into SP4000T. Astell\u0026amp;Kern’s own analog sound — comfortable to listen to, yet revealing new depth and character the longer you experience it.\u003c\/p\u003e\n\u003cp\u003eDiscover it for yourself with A\u0026amp;ultima SP4000T.\u003c\/p\u003e\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cstyle data-emotion-css=\"96q1si\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-block builder-b99edfe94b66412bbbf987883bcd1746 builder-has-component css-96q1si\" builder-id=\"builder-b99edfe94b66412bbbf987883bcd1746\"\u003e\n\u003cstyle data-emotion-css=\"1840m1q\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-columns css-1840m1q\"\u003e\n\u003cstyle data-emotion-css=\"2keume\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-column css-2keume\"\u003e\u003cdiv class=\"builder-blocks builder-blocks-child css-h47494\" builder-type=\"blocks\" builder-parent-id=\"builder-b99edfe94b66412bbbf987883bcd1746\"\u003e\u003cdiv class=\"builder-block builder-69a581ed25314a018b5af8d550788876 builder-has-component css-hgfgng\" builder-id=\"builder-69a581ed25314a018b5af8d550788876\"\u003e\u003cspan class=\"builder-text css-1qggkls\"\u003e\u003ch3\u003eRAYTHEON JAN6418 Quad — A New Standard in Tube Configuration\u003c\/h3\u003e\n\u003cp\u003eThe SP4000T is the industry's first DAP to feature the MIL-Spec vintage vacuum tube RAYTHEON JAN6418 in a Quad configuration.\u003c\/p\u003e\n\u003cp\u003eWith independent dual-tube structures dedicated to the left and right channels respectively, the channel-separated design — once exclusive to home audio high-end tube amplifiers — has finally been brought to the world of DAPs.\u003c\/p\u003e\u003c\/span\u003e\u003c\/div\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003cstyle data-emotion-css=\"bst442\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-column css-bst442\"\u003e\u003cdiv class=\"builder-blocks builder-blocks-child css-h47494\" builder-type=\"blocks\" 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https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F265e9a5c46fc47478263fd4049d0fa97?width=783 783w\" sizes=\"(max-width: 638px) 92vw, (max-width: 998px) 29vw, 56vw\"\u003e\u003c\/picture\u003e\u003cstyle data-emotion-css=\"b1xske\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-image-sizer css-b1xske\"\u003e \u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cstyle data-emotion-css=\"1i08357\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-block builder-8aa59ae9fd64402189a097556109f5e8 builder-has-component css-1i08357\" builder-id=\"builder-8aa59ae9fd64402189a097556109f5e8\"\u003e\u003cspan class=\"builder-text css-1qggkls\"\u003e\u003cp\u003eBut the essence is not the number of tubes. Managing multiple highly sensitive vacuum tubes is far more than a simple matter of addition. It demands answers to countless questions: How do you pair tubes with subtly different noise characteristics and gain rates? How do you overcome microphonic noise? How do you minimize output variation between left and right channels?\u003c\/p\u003e\n\u003cp\u003eThe four tubes in the SP4000T do not operate independently — they work in a differential configuration, with each pair facing the other in mirror symmetry. In this precise balance, music signals are amplified with twice the clarity, while common-mode noise is mutually cancelled and eliminated.\u003c\/p\u003e\n\u003cp\u003eEach of the four tubes is precisely measured for its noise and gain characteristics before being paired, then fully isolated from noise through independent modular flexible PCBs and a multi-layered architecture — a design that only Astell\u0026amp;Kern, with its long experience in analog circuits and vacuum tubes, could bring to life.\u003c\/p\u003e\n\u003cp\u003eWhen four hearts beat as one in perfect balance, the tube's signature rich harmonics resonate with the deepest, most resonant sound ever heard in the SP4000T.\u003c\/p\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cstyle data-emotion-css=\"jhah12\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-block builder-12a0e2756ada42b0a9fce55fa9bcce6f builder-has-component css-jhah12\" builder-id=\"builder-12a0e2756ada42b0a9fce55fa9bcce6f\"\u003e\u003cspan class=\"builder-text css-1qggkls\"\u003e\u003cp\u003eThe SP4000T is the industry's first DAP to feature Triple Tube Mode. Combined with the T Series Signature Triple AMP Mode and the Tube Current level adjustment first found on the SP3000T, it offers up to 54 possible combinations tailored to any genre or preference — a true Analog Sound Palette.\u003c\/p\u003e\n\u003cp\u003eBecause how you operate the same tube fundamentally changes its tonal character, Triple Tube Mode encompasses the full expressive range of a tube amplifier. 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src=\"https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Fce7f631cc6a04820a71f8ab2e923e3ec?width=1585\" srcset=\"https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Fce7f631cc6a04820a71f8ab2e923e3ec?width=100 100w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Fce7f631cc6a04820a71f8ab2e923e3ec?width=200 200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Fce7f631cc6a04820a71f8ab2e923e3ec?width=400 400w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Fce7f631cc6a04820a71f8ab2e923e3ec?width=800 800w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Fce7f631cc6a04820a71f8ab2e923e3ec?width=1200 1200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Fce7f631cc6a04820a71f8ab2e923e3ec?width=1600 1600w, 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builder-parent-id=\"builder-a0feafb09e68460cb2a703fae935fc0d\"\u003e\u003cdiv class=\"builder-block builder-3071b878bf46423e8b359a567c882fc5 css-1y6p72u\" builder-id=\"builder-3071b878bf46423e8b359a567c882fc5\"\u003e\n\u003cpicture\u003e\u003csource srcset=\"https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F6ed384052e5d484abb12c9713b0b0f07?format=webp\u0026amp;width=100 100w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F6ed384052e5d484abb12c9713b0b0f07?format=webp\u0026amp;width=200 200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F6ed384052e5d484abb12c9713b0b0f07?format=webp\u0026amp;width=400 400w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F6ed384052e5d484abb12c9713b0b0f07?format=webp\u0026amp;width=800 800w, 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srcset=\"https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F6ed384052e5d484abb12c9713b0b0f07?width=100 100w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F6ed384052e5d484abb12c9713b0b0f07?width=200 200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F6ed384052e5d484abb12c9713b0b0f07?width=400 400w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F6ed384052e5d484abb12c9713b0b0f07?width=800 800w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F6ed384052e5d484abb12c9713b0b0f07?width=1200 1200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F6ed384052e5d484abb12c9713b0b0f07?width=1600 1600w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F6ed384052e5d484abb12c9713b0b0f07?width=2000 2000w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F6ed384052e5d484abb12c9713b0b0f07?width=783 783w\" sizes=\"(max-width: 638px) 92vw, (max-width: 998px) 29vw, 56vw\"\u003e\u003c\/picture\u003e\u003cstyle data-emotion-css=\"13h6lf4\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-image-sizer css-13h6lf4\"\u003e \u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003cdiv class=\"builder-column css-bst442\"\u003e\u003cdiv class=\"builder-blocks builder-blocks-child css-h47494\" builder-type=\"blocks\" builder-parent-id=\"builder-a0feafb09e68460cb2a703fae935fc0d\"\u003e\u003cdiv class=\"builder-block builder-639237418cba42ff9b40ce3cae25cb7a builder-has-component css-hgfgng\" builder-id=\"builder-639237418cba42ff9b40ce3cae25cb7a\"\u003e\u003cspan class=\"builder-text css-1qggkls\"\u003e\u003ch3\u003eTriode Mode — The Purest Voice of the Tube\u003c\/h3\u003e\n\u003cp\u003eThis mode brings out the richest harmonic texture unique to vacuum tubes, letting the breath of a vocalist and the trembling of strings gently dissolve into a lush, lingering reverb.\u003c\/p\u003e\n\u003ch3\u003eUltra Linear Mode — The Aesthetics of Balance\u003c\/h3\u003e\n\u003cp\u003eA design that blends the tonal color of Triode with the output of Pentode. The sound fades softly at its edges, yet carries a firm, solid core — a well-balanced mode capable of rendering every genre with authority.\u003c\/p\u003e\n\u003ch3\u003ePentode Mode — The Most Powerful Voice of the Tube\u003c\/h3\u003e\n\u003cp\u003eMaximizing tube amplifier output and dynamic range, this mode retains the tube's signature warmth while stripping away reverb — delivering a clean, powerful presence that speaks with directness and force.\u003c\/p\u003e\u003c\/span\u003e\u003c\/div\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003cstyle data-emotion-css=\"z9mqop\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-block builder-7d56d1f30836482fb26b97747837bf3f builder-has-component css-z9mqop\" builder-id=\"builder-7d56d1f30836482fb26b97747837bf3f\"\u003e\u003cspan class=\"builder-text css-1qggkls\"\u003e\u003ch3\u003eThe Perfect Harmony of Real Vacuum Tubes and OPAMP, Astell\u0026amp;Kern's TRIPLE AMP SYSTEM\u003c\/h3\u003e\n\u003cp\u003eA\u0026amp;ultima SP4000T, built on Astell\u0026amp;Kern's exclusive Teraton Alpha technology, achieves a perfect fusion of true analog sound from the Quad-configured Real Vacuum Tubes and the dynamic sound of the OPAMP. SP4000T offers TUBE AMP mode for the authentic analog sound of a tube amplifier, OP AMP mode delivering Astell\u0026amp;Kern's signature clarity and expansive soundstage, and HYBRID AMP mode combining the best of both analog warmth and high-resolution output.\u003c\/p\u003e\n\u003cp\u003eExperience a distinctly differentiated sound through the T Series' signature amplifier technology.\u003c\/p\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cstyle data-emotion-css=\"5xb31m\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-block builder-7579c325b10c41bead7d222d17f72e85 builder-has-component css-5xb31m\" builder-id=\"builder-7579c325b10c41bead7d222d17f72e85\"\u003e\u003cdiv class=\"builder-columns css-1840m1q\"\u003e\n\u003cdiv class=\"builder-column css-2keume\"\u003e\u003cdiv class=\"builder-blocks builder-blocks-child css-h47494\" builder-type=\"blocks\" builder-parent-id=\"builder-7579c325b10c41bead7d222d17f72e85\"\u003e\u003cdiv class=\"builder-block builder-72ca59fd35ab4ed083eb044d0e15f9be builder-has-component css-hgfgng\" builder-id=\"builder-72ca59fd35ab4ed083eb044d0e15f9be\"\u003e\u003cspan class=\"builder-text css-1qggkls\"\u003e\u003ch3\u003eOverwhelming High Resolution and Dynamics, OP AMP Mode\u003c\/h3\u003e\n\u003cp\u003eHigh resolution that reproduces the original sound without distortion, an unparalleled sense of space, and the ultimate in clarity and dynamics — OP AMP mode delivers the pinnacle of high-quality sound that Astell\u0026amp;Kern has pioneered across every product. The ultra-low noise and high resolution achieved through Astell\u0026amp;Kern's TERATON ALPHA technology will reveal new dimensions of music you have never experienced before, across every genre.\u003c\/p\u003e\n\u003ch3\u003eTrue Analog Sound, TUBE AMP Mode\u003c\/h3\u003e\n\u003cp\u003eThe warm texture and unique soundstage of a Tube Amp cannot be replicated by any modern digital amplifier. Beloved since the very first appearance of tube amplifiers, they remain unmatched in conveying the emotional depth of music. SP4000T's TUBE AMP mode pairs the deep, rich analog sound exclusive to its Quad-configured Real Vacuum Tubes with groundbreaking low noise achieved through cutting-edge technology and craftsmanship — letting you lose yourself entirely in the music.\u003c\/p\u003e\n\u003ch3\u003eAstell\u0026amp;Kern's Advanced HYBRID AMP Mode\u003c\/h3\u003e\n\u003cp\u003eBeyond just two modes — Tube AMP and OP AMP — a next-generation Hybrid AMP mode lets you handpick your preferred tonal character. Combining the analog sensibility with the advantages of high-resolution output, the five-stage HYBRID AMP mode allows you to freely dial in the perfect sound for your taste and your music.\u003c\/p\u003e\u003c\/span\u003e\u003c\/div\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003cdiv class=\"builder-column css-bst442\"\u003e\u003cdiv class=\"builder-blocks builder-blocks-child css-h47494\" builder-type=\"blocks\" builder-parent-id=\"builder-7579c325b10c41bead7d222d17f72e85\"\u003e\n\u003cdiv class=\"builder-block builder-da3fc5c7732b4f968f71ba36ff39c74c css-1y6p72u\" builder-id=\"builder-da3fc5c7732b4f968f71ba36ff39c74c\"\u003e\n\u003cpicture\u003e\u003csource srcset=\"https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F9c820959c6314d12b0339fd6f76b7d4e?format=webp\u0026amp;width=100 100w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F9c820959c6314d12b0339fd6f76b7d4e?format=webp\u0026amp;width=200 200w, 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class=\"builder-image-sizer css-110q2ou\"\u003e \u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"builder-block builder-6498ad2c21694fd1b51680163541e1e6 builder-has-component css-hgfgng\" builder-id=\"builder-6498ad2c21694fd1b51680163541e1e6\"\u003e\u003cspan class=\"builder-text css-1qggkls\"\u003e\u003ch3\u003eThe Most Delicate Analog Sound, Tube Current Option\u003c\/h3\u003e\n\u003cp\u003eWe verified the safe operating range of the vacuum tubes and developed a system that adjusts the internal plate voltage across 3 levels, each of which changes the amplification of the tube amp — and with it, the tonal texture of the sound. Experience the subtle yet striking shifts in density and soundstage — the most delicate nuances a headphone or IEP can reveal — through tube current adjustment.\u003c\/p\u003e\n\u003ch3\u003eVacuum Tube LED\u003c\/h3\u003e\n\u003cp\u003eWhile operating in Tube or Hybrid mode, the vacuum tube on the back of the SP4000T glows with a soft, warm light — amplifying the subtle, stylish analog aesthetic.\u003c\/p\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003cdiv class=\"builder-column css-bst442\"\u003e\u003cdiv class=\"builder-blocks builder-blocks-child css-h47494\" builder-type=\"blocks\" builder-parent-id=\"builder-55966b320e48455a94c02bd0ed45efef\"\u003e\u003cdiv class=\"builder-block builder-f20a30dcb02a4466a08ec6cf36421a5f builder-has-component css-hgfgng\" builder-id=\"builder-f20a30dcb02a4466a08ec6cf36421a5f\"\u003e\u003cspan class=\"builder-text css-1qggkls\"\u003e\u003ch3\u003e2nd Generation Anti-Microphonic Noise Architecture\u003c\/h3\u003e\n\u003cp\u003eThe greatest technical challenge in applying vacuum tubes to a compact portable device is achieving low noise even at high resolution and high output. The SP4000T features twice as many tubes as its predecessor — four in total — and introduces an upgraded 5-stage 2nd Generation Architecture (up from the previous 4-stage design) to suppress microphonic noise (noise generated in vacuum tubes from even minor external vibrations). Drawing on Astell\u0026amp;Kern's proprietary know-how and years of experience, repeated rounds of design, testing, and verification led to the optimal solution for overcoming the structural limitations of microphonic noise.\u003c\/p\u003e\n\u003cp\u003e1. Separate modular Flexible PCB, isolated from Main PCB\u003c\/p\u003e\n\u003cp\u003e2. Silicone base cushion for primary shock absorption of the tube\u003c\/p\u003e\n\u003cp\u003e3. A custom-fit silicone tube around the tube leads to absorbing the impact transmitted through the leads\u003c\/p\u003e\n\u003cp\u003e4. Silicone damper encasing the tube, suspending it mid-air at the damper tip\u003c\/p\u003e\n\u003cp\u003e5. 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srcset=\"https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F6039e6113e75448d9b0684ff58f5fce1?width=100 100w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F6039e6113e75448d9b0684ff58f5fce1?width=200 200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F6039e6113e75448d9b0684ff58f5fce1?width=400 400w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F6039e6113e75448d9b0684ff58f5fce1?width=800 800w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F6039e6113e75448d9b0684ff58f5fce1?width=1200 1200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F6039e6113e75448d9b0684ff58f5fce1?width=1600 1600w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F6039e6113e75448d9b0684ff58f5fce1?width=2000 2000w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F6039e6113e75448d9b0684ff58f5fce1?width=783 783w\" sizes=\"(max-width: 638px) 92vw, (max-width: 998px) 29vw, 56vw\"\u003e\u003c\/picture\u003e\u003cdiv class=\"builder-image-sizer css-ik62m\"\u003e \u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003cstyle data-emotion-css=\"82z07t\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-block builder-f49cdd004cb14714b762c212d274cf88 builder-has-component css-82z07t\" builder-id=\"builder-f49cdd004cb14714b762c212d274cf88\"\u003e\u003cspan class=\"builder-text css-1qggkls\"\u003e\u003ch3\u003eHEXA Audio Circuit Structure with Complete Separation of Digital and Analog Signals\u003c\/h3\u003e\n\u003cp\u003eThe SP4000T integrates dual AK4499EX DACs—AKM’s latest flagship, proven across Astell\u0026amp;Kern devices—paired with dedicated AK4191EQ processors for each left and right channel, forming a fully discrete audio circuit architecture.\u003c\/p\u003e\n\u003cp\u003eUnlike conventional DAPs that handle both digital and analog signals inside the DAC, the SP4000T's audio circuit uses a dedicated digital delta-sigma modulator (AK4191EQ) to reduce noise in the digital signal before passing it to a completely isolated Analog DAC (AK4499EX) for independent analog signal processing.\u003c\/p\u003e\n\u003cp\u003eBuilt on this physically complete separation of digital and analog signal paths, the SP4000T's signature analog sound is realized with greater depth than ever before.\u003c\/p\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cstyle data-emotion-css=\"4f7qal\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-block builder-7c185701af694e4abb919d6cfe8fae19 css-4f7qal\" builder-id=\"builder-7c185701af694e4abb919d6cfe8fae19\"\u003e\n\u003cpicture\u003e\u003csource srcset=\"https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F664063fa80684808b73c901d579a03c2?format=webp\u0026amp;width=100 100w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F664063fa80684808b73c901d579a03c2?format=webp\u0026amp;width=200 200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F664063fa80684808b73c901d579a03c2?format=webp\u0026amp;width=400 400w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F664063fa80684808b73c901d579a03c2?format=webp\u0026amp;width=800 800w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F664063fa80684808b73c901d579a03c2?format=webp\u0026amp;width=1200 1200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F664063fa80684808b73c901d579a03c2?format=webp\u0026amp;width=1600 1600w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F664063fa80684808b73c901d579a03c2?format=webp\u0026amp;width=2000 2000w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F664063fa80684808b73c901d579a03c2?format=webp\u0026amp;width=1585 1585w\" type=\"image\/webp\"\u003e\u003cimg alt=\"SP4000T inside technology circuit\" loading=\"lazy\" class=\"builder-image css-1hbf805\" src=\"https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F664063fa80684808b73c901d579a03c2?width=1585\" srcset=\"https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F664063fa80684808b73c901d579a03c2?width=100 100w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F664063fa80684808b73c901d579a03c2?width=200 200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F664063fa80684808b73c901d579a03c2?width=400 400w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F664063fa80684808b73c901d579a03c2?width=800 800w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F664063fa80684808b73c901d579a03c2?width=1200 1200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F664063fa80684808b73c901d579a03c2?width=1600 1600w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F664063fa80684808b73c901d579a03c2?width=2000 2000w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F664063fa80684808b73c901d579a03c2?width=1585 1585w\" sizes=\"(max-width: 638px) 92vw, (max-width: 998px) 59vw, 114vw\"\u003e\u003c\/picture\u003e\u003cstyle data-emotion-css=\"39htpq\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-image-sizer css-39htpq\"\u003e \u003c\/div\u003e\n\u003c\/div\u003e\n\u003cstyle data-emotion-css=\"uicrvk\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-block builder-03a88cb8d43b4841991a24c0aee84d83 builder-has-component css-uicrvk\" builder-id=\"builder-03a88cb8d43b4841991a24c0aee84d83\"\u003e\u003cspan class=\"builder-text css-1qggkls\"\u003e\u003ch3\u003eHigh Driving Mode for the Ultimate Sound\u003c\/h3\u003e\n\u003cp\u003eThe SP4000T inherits the beloved High Driving Mode from the SP4000, acclaimed by audiophiles worldwide. With twice as many OPAMPs arranged horizontally, it delivers even greater sonic density. Like a four-wheel-drive vehicle conquering rough terrain, High Driving Mode channels superior driving power to produce a stronger, more stable sound — precisely articulating even the most easily missed sonic details, and designed for a deeper, more vivid listening experience.\u003c\/p\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cstyle data-emotion-css=\"1o8ydsm\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-block builder-d203128743d64a33beecb223a39a9807 builder-has-component css-1o8ydsm\" builder-id=\"builder-d203128743d64a33beecb223a39a9807\"\u003e\u003cdiv class=\"builder-columns css-1840m1q\"\u003e\n\u003cdiv class=\"builder-column css-2keume\"\u003e\u003cdiv class=\"builder-blocks builder-blocks-child css-h47494\" builder-type=\"blocks\" builder-parent-id=\"builder-d203128743d64a33beecb223a39a9807\"\u003e\u003cdiv class=\"builder-block builder-9d66ffed0dc645449daff781864cc037 css-1y6p72u\" builder-id=\"builder-9d66ffed0dc645449daff781864cc037\"\u003e\n\u003cpicture\u003e\u003csource srcset=\"https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Ff19a4640d63b4a12a9e4f6946e250640?format=webp\u0026amp;width=100 100w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Ff19a4640d63b4a12a9e4f6946e250640?format=webp\u0026amp;width=200 200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Ff19a4640d63b4a12a9e4f6946e250640?format=webp\u0026amp;width=400 400w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Ff19a4640d63b4a12a9e4f6946e250640?format=webp\u0026amp;width=800 800w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Ff19a4640d63b4a12a9e4f6946e250640?format=webp\u0026amp;width=1200 1200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Ff19a4640d63b4a12a9e4f6946e250640?format=webp\u0026amp;width=1600 1600w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Ff19a4640d63b4a12a9e4f6946e250640?format=webp\u0026amp;width=2000 2000w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Ff19a4640d63b4a12a9e4f6946e250640?format=webp\u0026amp;width=783 783w\" type=\"image\/webp\"\u003e\u003cimg alt=\"OPAMP: Series Configuration diagram\" loading=\"lazy\" class=\"builder-image css-1hbf805\" src=\"https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Ff19a4640d63b4a12a9e4f6946e250640?width=783\" srcset=\"https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Ff19a4640d63b4a12a9e4f6946e250640?width=100 100w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Ff19a4640d63b4a12a9e4f6946e250640?width=200 200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Ff19a4640d63b4a12a9e4f6946e250640?width=400 400w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Ff19a4640d63b4a12a9e4f6946e250640?width=800 800w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Ff19a4640d63b4a12a9e4f6946e250640?width=1200 1200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Ff19a4640d63b4a12a9e4f6946e250640?width=1600 1600w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Ff19a4640d63b4a12a9e4f6946e250640?width=2000 2000w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Ff19a4640d63b4a12a9e4f6946e250640?width=783 783w\" sizes=\"(max-width: 638px) 92vw, (max-width: 998px) 29vw, 56vw\"\u003e\u003c\/picture\u003e\u003cstyle data-emotion-css=\"ulm41q\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-image-sizer css-ulm41q\"\u003e \u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003cdiv class=\"builder-column css-bst442\"\u003e\u003cdiv class=\"builder-blocks builder-blocks-child css-h47494\" builder-type=\"blocks\" builder-parent-id=\"builder-d203128743d64a33beecb223a39a9807\"\u003e\u003cdiv class=\"builder-block builder-51407dca927a4353b230602ee12f52e0 builder-has-component css-hgfgng\" builder-id=\"builder-51407dca927a4353b230602ee12f52e0\"\u003e\u003cspan class=\"builder-text css-1qggkls\"\u003e\u003ch4 style=\"text-align: center;\"\u003e[ OPAMP: Series Configuration ]\u003c\/h4\u003e\n\u003cp style=\"text-align: center;\"\u003eDriving range increases linearly, but with increased noise and reduced SNR. While the sound may feel more powerful, it tends to become rougher or harsher.\u003c\/p\u003e\u003c\/span\u003e\u003c\/div\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003cstyle data-emotion-css=\"1jsxca3\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-block builder-987549e13d144917b3f4dc93c46ad61b builder-has-component css-1jsxca3\" builder-id=\"builder-987549e13d144917b3f4dc93c46ad61b\"\u003e\u003cdiv class=\"builder-columns css-1840m1q\"\u003e\n\u003cdiv class=\"builder-column css-2keume\"\u003e\u003cdiv class=\"builder-blocks builder-blocks-child css-h47494\" builder-type=\"blocks\" builder-parent-id=\"builder-987549e13d144917b3f4dc93c46ad61b\"\u003e\n\u003cstyle data-emotion-css=\"qguwqq\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-block builder-4e8e9d924b3e480883481f3fb4695e0f builder-has-component css-qguwqq\" builder-id=\"builder-4e8e9d924b3e480883481f3fb4695e0f\"\u003e\u003cspan class=\"builder-text css-1qggkls\"\u003e\u003cp\u003e[ OPAMP: Parallel Configuration ]\u003c\/p\u003e\n\u003cp\u003eThe driving range expands horizontally, with no increase in noise or reduction in SNR. This results in increased dynamic range and enhanced sound detail.\u003c\/p\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003cdiv class=\"builder-column css-bst442\"\u003e\u003cdiv class=\"builder-blocks builder-blocks-child css-h47494\" builder-type=\"blocks\" builder-parent-id=\"builder-987549e13d144917b3f4dc93c46ad61b\"\u003e\u003cdiv class=\"builder-block builder-a74f397df265441aa82a3073eec125bf css-1y6p72u\" builder-id=\"builder-a74f397df265441aa82a3073eec125bf\"\u003e\n\u003cpicture\u003e\u003csource srcset=\"https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F34d022e62af748a5b9efc0924d9621de?format=webp\u0026amp;width=100 100w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F34d022e62af748a5b9efc0924d9621de?format=webp\u0026amp;width=200 200w, 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Configuration diagram\" loading=\"lazy\" class=\"builder-image css-1hbf805\" src=\"https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F34d022e62af748a5b9efc0924d9621de?width=783\" srcset=\"https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F34d022e62af748a5b9efc0924d9621de?width=100 100w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F34d022e62af748a5b9efc0924d9621de?width=200 200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F34d022e62af748a5b9efc0924d9621de?width=400 400w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F34d022e62af748a5b9efc0924d9621de?width=800 800w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F34d022e62af748a5b9efc0924d9621de?width=1200 1200w, 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srcset=\"https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F672a9321965d4019a0f862f893aeccb5?width=100 100w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F672a9321965d4019a0f862f893aeccb5?width=200 200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F672a9321965d4019a0f862f893aeccb5?width=400 400w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F672a9321965d4019a0f862f893aeccb5?width=800 800w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F672a9321965d4019a0f862f893aeccb5?width=1200 1200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F672a9321965d4019a0f862f893aeccb5?width=1600 1600w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F672a9321965d4019a0f862f893aeccb5?width=2000 2000w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F672a9321965d4019a0f862f893aeccb5?width=783 783w\" sizes=\"(max-width: 638px) 92vw, (max-width: 998px) 29vw, 56vw\"\u003e\u003c\/picture\u003e\u003cstyle data-emotion-css=\"1pwz5xi\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-image-sizer css-1pwz5xi\"\u003e \u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003cdiv class=\"builder-column css-bst442\"\u003e\u003cdiv class=\"builder-blocks builder-blocks-child css-h47494\" builder-type=\"blocks\" builder-parent-id=\"builder-1e5bbd3217be4665987a1bbd2015d2c2\"\u003e\u003cdiv class=\"builder-block builder-e63e74c72b6e42ebaf7fdff83dc6bcee builder-has-component css-hgfgng\" builder-id=\"builder-e63e74c72b6e42ebaf7fdff83dc6bcee\"\u003e\u003cspan class=\"builder-text css-1qggkls\"\u003e\u003ch3\u003eProprietary ESA (Enhanced Signal Alignment) Technology for Minimized Group Delay\u003c\/h3\u003e\n\u003cp\u003eThe SP4000T dramatically improves Group Delay — one of audio's most persistent challenges — through its proprietary ESA (Enhanced Signal Alignment) technology. ESA aligns frequency signals so they arrive more uniformly, minimizing frequency distortion and delivering sound with greater clarity and purity.\u003c\/p\u003e\n\u003cp\u003e*What is Group Delay?\u003c\/p\u003e\n\u003cp\u003eGroup delay refers to the difference in time it takes for each frequency to pass through an internal audio system. In simple terms, it describes a phenomenon where different frequencies within an audio signal do not arrive simultaneously, resulting in slight timing delays across frequencies.\u003c\/p\u003e\u003c\/span\u003e\u003c\/div\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003cstyle data-emotion-css=\"i27oyv\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-block builder-39754bea66014ab29f7e50fad7b4768b builder-has-component css-i27oyv\" builder-id=\"builder-39754bea66014ab29f7e50fad7b4768b\"\u003e\u003cdiv class=\"builder-columns css-1840m1q\"\u003e\n\u003cdiv class=\"builder-column css-2keume\"\u003e\u003cdiv class=\"builder-blocks builder-blocks-child css-h47494\" builder-type=\"blocks\" builder-parent-id=\"builder-39754bea66014ab29f7e50fad7b4768b\"\u003e\u003cdiv class=\"builder-block builder-eb51f1ca7ed24f82bf5d05911d752577 css-1y6p72u\" builder-id=\"builder-eb51f1ca7ed24f82bf5d05911d752577\"\u003e\n\u003cpicture\u003e\u003csource srcset=\"https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Fc758d2d7ff0045139a1d3341201bb96d?format=webp\u0026amp;width=100 100w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Fc758d2d7ff0045139a1d3341201bb96d?format=webp\u0026amp;width=200 200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Fc758d2d7ff0045139a1d3341201bb96d?format=webp\u0026amp;width=400 400w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Fc758d2d7ff0045139a1d3341201bb96d?format=webp\u0026amp;width=800 800w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Fc758d2d7ff0045139a1d3341201bb96d?format=webp\u0026amp;width=1200 1200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Fc758d2d7ff0045139a1d3341201bb96d?format=webp\u0026amp;width=1600 1600w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Fc758d2d7ff0045139a1d3341201bb96d?format=webp\u0026amp;width=2000 2000w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Fc758d2d7ff0045139a1d3341201bb96d?format=webp\u0026amp;width=783 783w\" type=\"image\/webp\"\u003e\u003cimg alt=\"advanced DAR signal graph\" loading=\"lazy\" class=\"builder-image css-1hbf805\" src=\"https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Fc758d2d7ff0045139a1d3341201bb96d?width=783\" srcset=\"https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Fc758d2d7ff0045139a1d3341201bb96d?width=100 100w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Fc758d2d7ff0045139a1d3341201bb96d?width=200 200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Fc758d2d7ff0045139a1d3341201bb96d?width=400 400w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Fc758d2d7ff0045139a1d3341201bb96d?width=800 800w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Fc758d2d7ff0045139a1d3341201bb96d?width=1200 1200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Fc758d2d7ff0045139a1d3341201bb96d?width=1600 1600w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Fc758d2d7ff0045139a1d3341201bb96d?width=2000 2000w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Fc758d2d7ff0045139a1d3341201bb96d?width=783 783w\" sizes=\"(max-width: 638px) 92vw, (max-width: 998px) 29vw, 56vw\"\u003e\u003c\/picture\u003e\u003cstyle data-emotion-css=\"rmhty1\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-image-sizer css-rmhty1\"\u003e \u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003cdiv class=\"builder-column css-bst442\"\u003e\u003cdiv class=\"builder-blocks builder-blocks-child css-h47494\" builder-type=\"blocks\" builder-parent-id=\"builder-39754bea66014ab29f7e50fad7b4768b\"\u003e\u003cdiv class=\"builder-block builder-6e5c802275b8447b805952ed5ad6aad7 builder-has-component css-hgfgng\" builder-id=\"builder-6e5c802275b8447b805952ed5ad6aad7\"\u003e\u003cspan class=\"builder-text css-1qggkls\"\u003e\u003ch3\u003eAdvanced DAR Support for Enhanced Sound\u003c\/h3\u003e\n\u003cp\u003eAdvanced DAR is the 2nd-generation DAR technology, delivering even more natural and refined sound. Rather than passing audio directly to the DAR engine, it first routes the signal through VSE (Virtual Sound Extender) to virtually restore lost harmonics and enhance audio quality — then applies DAR technology in a second stage for a more complete upsampling result. This allows listeners to enjoy a deeper, more immersive sound that is truer to the original recording.\u003c\/p\u003e\u003c\/span\u003e\u003c\/div\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003cstyle data-emotion-css=\"1kuh0he\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-block builder-84bb2a09b4834b27ade6d46a514e51ae builder-has-component css-1kuh0he\" builder-id=\"builder-84bb2a09b4834b27ade6d46a514e51ae\"\u003e\u003cspan class=\"builder-text css-1qggkls\"\u003e\u003cp\u003eTo create the ultimate DAP unlike anything experienced before, we went beyond simply adopting the latest DACs and new specifications. We further evolved and applied TERATON ALPHA, Astell\u0026amp;Kern’s Ultimate Sound Solution, incorporating its advanced and innovative audio technologies.\u003c\/p\u003e\n\u003cp\u003eRefined through continuous research, TERATON ALPHA represents Astell\u0026amp;Kern’s integrated audio engineering expertise. Through effective power noise reduction, efficient power consumption with stable amplification, and a precisely engineered audio output interface, it delivers sound that remains faithful to the original source.\u003c\/p\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cstyle data-emotion-css=\"1hrq0m9\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-block builder-5c126830c0c84c28897e3b096c0aefd6 builder-has-component css-1hrq0m9\" builder-id=\"builder-5c126830c0c84c28897e3b096c0aefd6\"\u003e\u003cdiv class=\"builder-columns css-1840m1q\"\u003e\n\u003cdiv class=\"builder-column css-2keume\"\u003e\u003cdiv class=\"builder-blocks builder-blocks-child css-h47494\" builder-type=\"blocks\" builder-parent-id=\"builder-5c126830c0c84c28897e3b096c0aefd6\"\u003e\u003cdiv class=\"builder-block builder-f3bf25164eff4a408dfee9f7c897189b css-1y6p72u\" builder-id=\"builder-f3bf25164eff4a408dfee9f7c897189b\"\u003e\n\u003cpicture\u003e\u003csource 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https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F24dd860862c5452094d251fbb5f253aa?format=webp\u0026amp;width=1200 1200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F24dd860862c5452094d251fbb5f253aa?format=webp\u0026amp;width=1600 1600w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F24dd860862c5452094d251fbb5f253aa?format=webp\u0026amp;width=2000 2000w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F24dd860862c5452094d251fbb5f253aa?format=webp\u0026amp;width=783 783w\" type=\"image\/webp\"\u003e\u003cimg alt=\" TERATON ALPHA signal graph\" loading=\"lazy\" class=\"builder-image css-1hbf805\" src=\"https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F24dd860862c5452094d251fbb5f253aa?width=783\" srcset=\"https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F24dd860862c5452094d251fbb5f253aa?width=100 100w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F24dd860862c5452094d251fbb5f253aa?width=200 200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F24dd860862c5452094d251fbb5f253aa?width=400 400w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F24dd860862c5452094d251fbb5f253aa?width=800 800w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F24dd860862c5452094d251fbb5f253aa?width=1200 1200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F24dd860862c5452094d251fbb5f253aa?width=1600 1600w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F24dd860862c5452094d251fbb5f253aa?width=2000 2000w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F24dd860862c5452094d251fbb5f253aa?width=783 783w\" sizes=\"(max-width: 638px) 92vw, (max-width: 998px) 29vw, 56vw\"\u003e\u003c\/picture\u003e\u003cstyle data-emotion-css=\"19tumk8\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-image-sizer css-19tumk8\"\u003e \u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003cstyle data-emotion-css=\"1bt39c0\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-block builder-edb9da6de73843f58efb62ddc13d962b builder-has-component css-1bt39c0\" builder-id=\"builder-edb9da6de73843f58efb62ddc13d962b\"\u003e\u003cspan class=\"builder-text css-1qggkls\"\u003e\u003ch3\u003eAstell\u0026amp;Kern Direct Path for Bit-Perfect Playback\u003c\/h3\u003e\n\u003cp\u003eADP (Astell\u0026amp;Kern Direct Path) — Astell\u0026amp;Kern's proprietary customization technology — bypasses the Sample Rate Conversion (SRC) limitation inherent to the Android OS, enabling lossless Bit-perfect playback even in streaming environments for the highest possible audio quality.\u003c\/p\u003e\n\u003cp\u003eKeeping pace with the shift toward streaming-centric listening, the SP4000T runs the latest Android 15 — delivering top-tier analog sound quality alongside exceptional convenience.\u003c\/p\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cstyle data-emotion-css=\"2aics9\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-block builder-3233cecb79c24dd3a6f584d4cf4ffdd2 builder-has-component css-2aics9\" builder-id=\"builder-3233cecb79c24dd3a6f584d4cf4ffdd2\"\u003e\u003cdiv class=\"builder-columns css-1840m1q\"\u003e\n\u003cstyle data-emotion-css=\"1725ttl\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-column css-1725ttl\"\u003e\u003cdiv class=\"builder-blocks builder-blocks-child css-h47494\" builder-type=\"blocks\" builder-parent-id=\"builder-3233cecb79c24dd3a6f584d4cf4ffdd2\"\u003e\n\u003cdiv class=\"builder-block builder-790c986b007b418e94649766f7d652df css-1y6p72u\" builder-id=\"builder-790c986b007b418e94649766f7d652df\"\u003e\n\u003cpicture\u003e\u003csource srcset=\"https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F45a86a8f792d45acb958fa25e72883c5?format=webp\u0026amp;width=100 100w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F45a86a8f792d45acb958fa25e72883c5?format=webp\u0026amp;width=200 200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F45a86a8f792d45acb958fa25e72883c5?format=webp\u0026amp;width=400 400w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F45a86a8f792d45acb958fa25e72883c5?format=webp\u0026amp;width=800 800w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F45a86a8f792d45acb958fa25e72883c5?format=webp\u0026amp;width=1200 1200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F45a86a8f792d45acb958fa25e72883c5?format=webp\u0026amp;width=1600 1600w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F45a86a8f792d45acb958fa25e72883c5?format=webp\u0026amp;width=2000 2000w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F45a86a8f792d45acb958fa25e72883c5?format=webp\u0026amp;width=583 583w\" type=\"image\/webp\"\u003e\u003cimg alt=\"SP3000 Layer Structure\" loading=\"lazy\" class=\"builder-image css-1hbf805\" src=\"https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F45a86a8f792d45acb958fa25e72883c5?width=583\" srcset=\"https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F45a86a8f792d45acb958fa25e72883c5?width=100 100w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F45a86a8f792d45acb958fa25e72883c5?width=200 200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F45a86a8f792d45acb958fa25e72883c5?width=400 400w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F45a86a8f792d45acb958fa25e72883c5?width=800 800w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F45a86a8f792d45acb958fa25e72883c5?width=1200 1200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F45a86a8f792d45acb958fa25e72883c5?width=1600 1600w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F45a86a8f792d45acb958fa25e72883c5?width=2000 2000w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F45a86a8f792d45acb958fa25e72883c5?width=583 583w\" sizes=\"(max-width: 638px) 92vw, (max-width: 998px) 19vw, 37vw\"\u003e\u003c\/picture\u003e\u003cstyle data-emotion-css=\"1m43vrx\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-image-sizer css-1m43vrx\"\u003e \u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"builder-block builder-0076b7f9402b4fa6896d90979e3187b4 builder-has-component css-hgfgng\" builder-id=\"builder-0076b7f9402b4fa6896d90979e3187b4\"\u003e\u003cspan class=\"builder-text css-1qggkls\"\u003e\u003ch4 style=\"text-align: center;\"\u003e[ SP3000 Layer Structure ]\u003c\/h4\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003cstyle data-emotion-css=\"16m31b8\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-column css-16m31b8\"\u003e\u003cdiv class=\"builder-blocks builder-blocks-child css-h47494\" builder-type=\"blocks\" builder-parent-id=\"builder-3233cecb79c24dd3a6f584d4cf4ffdd2\"\u003e\u003cdiv class=\"builder-block builder-e3f00d51051c4f099307a23b1c52c515 builder-has-component css-qguwqq\" builder-id=\"builder-e3f00d51051c4f099307a23b1c52c515\"\u003e\u003cspan class=\"builder-text css-1qggkls\"\u003e\u003ch3\u003ePrecision Sound with Any Layer HDI PCB\u003c\/h3\u003e\n\u003cp\u003eThe SP4000T uses the same Any Layer HDI PCB for high performance as the SP4000. Commonly found in smartphones and high-end electronics, this high-density circuit board enables the precise design of complex circuits within a smaller footprint — minimizing signal loss and delivering more refined sound.\u003c\/p\u003e\u003c\/span\u003e\u003c\/div\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003cdiv class=\"builder-column css-16m31b8\"\u003e\u003cdiv class=\"builder-blocks builder-blocks-child css-h47494\" builder-type=\"blocks\" builder-parent-id=\"builder-3233cecb79c24dd3a6f584d4cf4ffdd2\"\u003e\n\u003cdiv class=\"builder-block builder-d6343ff98027488cadba8d6ad22ae8ab css-1y6p72u\" builder-id=\"builder-d6343ff98027488cadba8d6ad22ae8ab\"\u003e\n\u003cpicture\u003e\u003csource srcset=\"https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F5b296533a14d461ab772026b688a5423?format=webp\u0026amp;width=100 100w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F5b296533a14d461ab772026b688a5423?format=webp\u0026amp;width=200 200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F5b296533a14d461ab772026b688a5423?format=webp\u0026amp;width=400 400w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F5b296533a14d461ab772026b688a5423?format=webp\u0026amp;width=800 800w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F5b296533a14d461ab772026b688a5423?format=webp\u0026amp;width=1200 1200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F5b296533a14d461ab772026b688a5423?format=webp\u0026amp;width=1600 1600w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F5b296533a14d461ab772026b688a5423?format=webp\u0026amp;width=2000 2000w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F5b296533a14d461ab772026b688a5423?format=webp\u0026amp;width=583 583w\" type=\"image\/webp\"\u003e\u003cimg alt=\"SP4000T Layer Structure \" loading=\"lazy\" class=\"builder-image css-1hbf805\" src=\"https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F5b296533a14d461ab772026b688a5423?width=583\" srcset=\"https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F5b296533a14d461ab772026b688a5423?width=100 100w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F5b296533a14d461ab772026b688a5423?width=200 200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F5b296533a14d461ab772026b688a5423?width=400 400w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F5b296533a14d461ab772026b688a5423?width=800 800w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F5b296533a14d461ab772026b688a5423?width=1200 1200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F5b296533a14d461ab772026b688a5423?width=1600 1600w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F5b296533a14d461ab772026b688a5423?width=2000 2000w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F5b296533a14d461ab772026b688a5423?width=583 583w\" sizes=\"(max-width: 638px) 92vw, (max-width: 998px) 19vw, 37vw\"\u003e\u003c\/picture\u003e\u003cstyle data-emotion-css=\"1im8ksq\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-image-sizer css-1im8ksq\"\u003e \u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"builder-block builder-0f4f917d2e72432cb4b25833d4bd13ca builder-has-component css-hgfgng\" builder-id=\"builder-0f4f917d2e72432cb4b25833d4bd13ca\"\u003e\u003cspan class=\"builder-text css-1qggkls\"\u003e\u003ch4 style=\"text-align: center;\"\u003e[ SP4000T Layer Structure ]\u003c\/h4\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003cstyle data-emotion-css=\"1jhojgf\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-block builder-ca5ae87aa6bd402a952c60ed8e21dc21 builder-has-component css-1jhojgf\" builder-id=\"builder-ca5ae87aa6bd402a952c60ed8e21dc21\"\u003e\u003cspan class=\"builder-text css-1qggkls\"\u003e\u003cp\u003e99.9% Pure Copper Shield Can\u003c\/p\u003e\n\u003cp\u003eThe SP4000T employs a complete Shield Can design to block noise and electromagnetic interference that could affect the audio block. Using a 99.9% pure copper Shield Can, it goes beyond basic shielding to deliver an even cleaner, more vivid sound.\u003c\/p\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cstyle data-emotion-css=\"1v3a6gf\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-block builder-3509f43e36e1491f9141cda4ab57868d builder-has-component css-1v3a6gf\" builder-id=\"builder-3509f43e36e1491f9141cda4ab57868d\"\u003e\u003cspan class=\"builder-text css-1qggkls\"\u003e\u003ch3\u003eSound Design Through DAC Filters\u003c\/h3\u003e\n\u003cp\u003eDesign your own sound style with 7 DAC filters.\u003c\/p\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cstyle data-emotion-css=\"a2xzok\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-block builder-8fd43354d73e4a22b39d3c3e8958f70c builder-has-component css-a2xzok\" builder-id=\"builder-8fd43354d73e4a22b39d3c3e8958f70c\"\u003e\u003cdiv class=\"builder-columns css-1840m1q\"\u003e\n\u003cstyle data-emotion-css=\"18a9yoj\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-column css-18a9yoj\"\u003e\u003cdiv class=\"builder-blocks builder-blocks-child css-h47494\" builder-type=\"blocks\" builder-parent-id=\"builder-8fd43354d73e4a22b39d3c3e8958f70c\"\u003e\u003cdiv class=\"builder-block builder-e15d5a9ac48843a6a54b27dbb727e713 builder-has-component css-hgfgng\" builder-id=\"builder-e15d5a9ac48843a6a54b27dbb727e713\"\u003e\u003cspan class=\"builder-text css-1qggkls\"\u003e\u003cp\u003e\u003cspan style=\"font-size: 16px;\"\u003eSound Type\u003c\/span\u003e\u003c\/p\u003e\u003c\/span\u003e\u003c\/div\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003cstyle data-emotion-css=\"ywllz7\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-column css-ywllz7\"\u003e\u003cdiv class=\"builder-blocks builder-blocks-child css-h47494\" builder-type=\"blocks\" builder-parent-id=\"builder-8fd43354d73e4a22b39d3c3e8958f70c\"\u003e\u003cdiv class=\"builder-block builder-7c19547448c24f3ba188f8970936f26e builder-has-component css-hgfgng\" builder-id=\"builder-7c19547448c24f3ba188f8970936f26e\"\u003e\u003cspan class=\"builder-text css-1qggkls\"\u003e\u003cp\u003e Impulse Response\u003c\/p\u003e\u003c\/span\u003e\u003c\/div\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003cdiv class=\"builder-column css-ywllz7\"\u003e\u003cdiv class=\"builder-blocks builder-blocks-child css-h47494\" builder-type=\"blocks\" builder-parent-id=\"builder-8fd43354d73e4a22b39d3c3e8958f70c\"\u003e\u003cdiv class=\"builder-block builder-72564904b50a4a55a739e84357c5505d builder-has-component css-hgfgng\" builder-id=\"builder-72564904b50a4a55a739e84357c5505d\"\u003e\u003cspan class=\"builder-text css-1qggkls\"\u003e\u003cp\u003e Filter name\u003c\/p\u003e\u003c\/span\u003e\u003c\/div\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003cdiv class=\"builder-column css-ywllz7\"\u003e\u003cdiv class=\"builder-blocks builder-blocks-child css-h47494\" builder-type=\"blocks\" builder-parent-id=\"builder-8fd43354d73e4a22b39d3c3e8958f70c\"\u003e\u003cdiv class=\"builder-block builder-6a775c9389744bc7a83a6ea5414dd64d builder-has-component css-hgfgng\" builder-id=\"builder-6a775c9389744bc7a83a6ea5414dd64d\"\u003e\u003cspan class=\"builder-text css-1qggkls\"\u003e\u003cp\u003e Remarks\u003c\/p\u003e\u003c\/span\u003e\u003c\/div\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003cdiv class=\"builder-column css-ywllz7\"\u003e\u003cdiv class=\"builder-blocks builder-blocks-child css-h47494\" builder-type=\"blocks\" builder-parent-id=\"builder-8fd43354d73e4a22b39d3c3e8958f70c\"\u003e\u003cdiv class=\"builder-block builder-cf0f2af41c0f40c4a6a7a81bf5615c46 builder-has-component css-hgfgng\" builder-id=\"builder-cf0f2af41c0f40c4a6a7a81bf5615c46\"\u003e\u003cspan class=\"builder-text css-1qggkls\"\u003e\u003cp\u003e Edge\u003c\/p\u003e\u003c\/span\u003e\u003c\/div\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003cstyle data-emotion-css=\"1v9quqp\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-block 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class=\"builder-blocks builder-blocks-child css-h47494\" builder-type=\"blocks\" builder-parent-id=\"builder-c0141a88839b468291b44486fd858e34\"\u003e\u003cdiv class=\"builder-block builder-18501d32fab24feb83dbff04158ec95c builder-has-component css-hgfgng\" builder-id=\"builder-18501d32fab24feb83dbff04158ec95c\"\u003e\u003cspan class=\"builder-text css-1qggkls\"\u003e\u003cp\u003eSlow Roll-off\u003c\/p\u003e\u003c\/span\u003e\u003c\/div\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003cdiv class=\"builder-column css-ywllz7\"\u003e\u003cdiv class=\"builder-blocks builder-blocks-child css-h47494\" builder-type=\"blocks\" builder-parent-id=\"builder-c0141a88839b468291b44486fd858e34\"\u003e\u003cdiv class=\"builder-block builder-d86c97681a5241578cf9087d7595409a builder-has-component css-hgfgng\" builder-id=\"builder-d86c97681a5241578cf9087d7595409a\"\u003e\u003cspan class=\"builder-text css-1qggkls\"\u003e\u003cp\u003eMinimal echo reproduces original 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builder-has-component css-hgfgng\" builder-id=\"builder-63acb4deaa7142a386f75cd18a902c0c\"\u003e\u003cspan class=\"builder-text css-1qggkls\"\u003e\u003cp\u003ePre and post echoes make powerful sound\u003c\/p\u003e\u003c\/span\u003e\u003c\/div\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003cdiv class=\"builder-column css-ywllz7\"\u003e\u003cdiv class=\"builder-blocks builder-blocks-child css-h47494\" builder-type=\"blocks\" builder-parent-id=\"builder-638a89d5ea9d4f7babd583a166b09fb0\"\u003e\u003cdiv class=\"builder-block builder-2233e0ff67e04f49abf9b1456ea35be9 builder-has-component css-hgfgng\" builder-id=\"builder-2233e0ff67e04f49abf9b1456ea35be9\"\u003e\u003cspan class=\"builder-text css-1qggkls\"\u003e\u003cp\u003eSlow\u003c\/p\u003e\u003c\/span\u003e\u003c\/div\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003cstyle data-emotion-css=\"689ao9\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-block builder-d9ea365085cd411bb0aa1fe024df75a7 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protection mode settingon device\" loading=\"lazy\" class=\"builder-image css-1hbf805\" src=\"https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Ffa45b5b7a3544765a3ffc6a8b0822849?width=783\" srcset=\"https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Ffa45b5b7a3544765a3ffc6a8b0822849?width=100 100w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Ffa45b5b7a3544765a3ffc6a8b0822849?width=200 200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Ffa45b5b7a3544765a3ffc6a8b0822849?width=400 400w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Ffa45b5b7a3544765a3ffc6a8b0822849?width=800 800w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2Ffa45b5b7a3544765a3ffc6a8b0822849?width=1200 1200w, 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builder-id=\"builder-3c65fe6ef72244f8a35f509157410bd9\"\u003e\u003cspan class=\"builder-text css-1qggkls\"\u003e\u003ch3\u003eEnhanced Battery Protection Mode\u003c\/h3\u003e\n\u003cp\u003eThe battery protection mode — previously fixed at 85% — now offers a wider range of options. Choose the option that best fits your Music Lifestyle.\u003c\/p\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv class=\"builder-block builder-eda64f72752c4f418a335ef72f862928 builder-has-component css-hgfgng\" builder-id=\"builder-eda64f72752c4f418a335ef72f862928\"\u003e\u003cspan class=\"builder-text css-1qggkls\"\u003e\u003ch3\u003eReal-Time Information with LED Lights\u003c\/h3\u003e\n\u003cp\u003eThe LED light surrounding the power button provides information on the Bit Depth of the currently playing song, and also adds a visually pleasing element by making it shine and stand out.\u003c\/p\u003e\n\u003cp\u003e* The LED light can be turned on or off according to user settings.\u003c\/p\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003cstyle data-emotion-css=\"15h5ld0\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-block builder-bdb7e83c24164ab6b1d5c84023c2c7b0 builder-has-component css-15h5ld0\" builder-id=\"builder-bdb7e83c24164ab6b1d5c84023c2c7b0\"\u003e\u003cspan class=\"builder-text css-1qggkls\"\u003e\u003ch3\u003eCrossfeed, a Speaker-like Experience Through Headphones\u003c\/h3\u003e\n\u003cp\u003eCrossfeed mixes part of the opposite channel signal with a slight time delay and sends it to each channel, creating the effect of positioning the sound toward the center, similar to listening through speakers. This provides a more natural listening experience and helps reduce ear fatigue. With detailed settings such as Shelf Cutoff, Shelf Gain, and Mixer Level, you can fine-tune the sound to your personal preference.\u003c\/p\u003e\n\u003ch3\u003eReplayGain for Automatic Volume Leveling\u003c\/h3\u003e\n\u003cp\u003eReplayGain has been applied to automatically adjust tracks with different volume levels to a consistent loudness. Enjoy your own playlists more comfortably with ReplayGain.\u003c\/p\u003e\n\u003cp\u003e* ReplayGain supports audio files up to 24-bit\/192kHz.\u003c\/p\u003e\n\u003ch3\u003eNative DSD512, 32-bit\/768kHz Support\u003c\/h3\u003e\n\u003cp\u003eComplete premium sound with Astell\u0026amp;Kern’s exclusive technology. With support for Native DSD512 and up to 32-bit\/768kHz high-resolution playback, you can enjoy the music you love with outstanding performance.\u003c\/p\u003e\n\u003ch3\u003eWireless Hi-Fi Sound with BT Sink\u003c\/h3\u003e\n\u003cp\u003eWith BT Sink, you can connect SP4000T to an external device via Bluetooth, just like connecting a smartphone to a Bluetooth speaker. Music playing on the external device can then be transmitted to SP4000T through the BT Sink.\u003c\/p\u003e\n\u003ch3\u003eUSB PD 3.0 Fast Charging Support\u003c\/h3\u003e\n\u003cp\u003eWith USB PD 3.0 fast charging support, SP4000T can be fully charged in approximately 5 hours.\u003c\/p\u003e\n\u003ch3\u003eLarge 6-inch Full HD Display\u003c\/h3\u003e\n\u003cp\u003eWith its larger 6-inch Full HD display offering outstanding image quality, you can enjoy the SP4000T more comfortably and conveniently.\u003c\/p\u003e\n\u003ch3\u003eAstell\u0026amp;Kern’s First Dual-Antenna Design\u003c\/h3\u003e\n\u003cp\u003eExperience faster, more stable downloads with Astell\u0026amp;Kern’s first-ever dual-antenna design. Based on internal testing, 5GHz download speeds are approximately 2x faster compared to the previous model.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cstyle data-emotion-css=\"5tq7zh\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-block builder-1f7215c8b98542bd8e1bd7a2dba43414 builder-has-component css-5tq7zh\" builder-id=\"builder-1f7215c8b98542bd8e1bd7a2dba43414\"\u003e\u003cdiv class=\"builder-columns css-1840m1q\"\u003e\n\u003cdiv class=\"builder-column css-2keume\"\u003e\u003cdiv class=\"builder-blocks builder-blocks-child css-h47494\" builder-type=\"blocks\" builder-parent-id=\"builder-1f7215c8b98542bd8e1bd7a2dba43414\"\u003e\n\u003cdiv class=\"builder-block builder-190e8eea40644c3b95112e785645a7fa builder-has-component css-hgfgng\" builder-id=\"builder-190e8eea40644c3b95112e785645a7fa\"\u003e\u003cspan class=\"builder-text css-1qggkls\"\u003e\u003ch3\u003eThe Premium Leather Case\u003c\/h3\u003e\n\u003cp\u003eThe bundled leather case for the SP4000T was crafted using 'MINERVA' leather from 'BADALASSI CARLO', a renowned leather workshop located in the San Miniato district of Florence, Italy.\u003c\/p\u003e\n\u003cp\u003eBadalassi Carlo is a tannery that has been producing leather for over 40 years, combining the traditional Tuscan vegetable tanning methods with the theories and techniques of CARLO BADALASSI, a former leather-school professor from the Santa Croce region.\u003c\/p\u003e\n\u003cp\u003eVegetable tanning is an eco-friendly leather-making process — slow and time-intensive — that tans hides using only plant-derived tannin extracts. Badalassi Carlo leathers employ the Tuscan vacchetta technique — after removing the hair from the hide, bovine bone powder-derived tallow is added during the vegetable oil tanning process.\u003c\/p\u003e\n\u003cp\u003ePursuing small-batch, high-quality production over mass output, the workshop is highly regarded as the preferred leather artisan for renowned brands that place a premium on material quality.\u003c\/p\u003e\n\u003cp\u003eThe case is available in 'Cognac' color and wraps snugly around the entire device, offering a perfect fit while featuring a rear pattern cutout designed to showcase the tube LED glow.\u003c\/p\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv class=\"builder-block builder-552a8c1a02334f50966525c441790a9e css-1y6p72u\" builder-id=\"builder-552a8c1a02334f50966525c441790a9e\"\u003e\n\u003cpicture\u003e\u003csource srcset=\"https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F504781ace8d0449b99b4182a3ae2650a?format=webp\u0026amp;width=100 100w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F504781ace8d0449b99b4182a3ae2650a?format=webp\u0026amp;width=200 200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F504781ace8d0449b99b4182a3ae2650a?format=webp\u0026amp;width=400 400w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F504781ace8d0449b99b4182a3ae2650a?format=webp\u0026amp;width=800 800w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F504781ace8d0449b99b4182a3ae2650a?format=webp\u0026amp;width=1200 1200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F504781ace8d0449b99b4182a3ae2650a?format=webp\u0026amp;width=1600 1600w, 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\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003cdiv class=\"builder-column css-bst442\"\u003e\u003cdiv class=\"builder-blocks builder-blocks-child css-h47494\" builder-type=\"blocks\" builder-parent-id=\"builder-1f7215c8b98542bd8e1bd7a2dba43414\"\u003e\n\u003cdiv class=\"builder-block builder-349cef1d6a52438cba8c2c5ed75c878b css-1y6p72u\" builder-id=\"builder-349cef1d6a52438cba8c2c5ed75c878b\"\u003e\n\u003cpicture\u003e\u003csource srcset=\"https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F71cdb0c96e1845368a08c0c72e9d76f1?format=webp\u0026amp;width=100 100w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F71cdb0c96e1845368a08c0c72e9d76f1?format=webp\u0026amp;width=200 200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F71cdb0c96e1845368a08c0c72e9d76f1?format=webp\u0026amp;width=400 400w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F71cdb0c96e1845368a08c0c72e9d76f1?format=webp\u0026amp;width=800 800w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F71cdb0c96e1845368a08c0c72e9d76f1?format=webp\u0026amp;width=1200 1200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F71cdb0c96e1845368a08c0c72e9d76f1?format=webp\u0026amp;width=1600 1600w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F71cdb0c96e1845368a08c0c72e9d76f1?format=webp\u0026amp;width=2000 2000w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F71cdb0c96e1845368a08c0c72e9d76f1?format=webp\u0026amp;width=783 783w\" type=\"image\/webp\"\u003e\u003cimg alt=\"SP4000T in leather case\" loading=\"lazy\" class=\"builder-image css-1hbf805\" src=\"https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F71cdb0c96e1845368a08c0c72e9d76f1?width=783\" srcset=\"https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F71cdb0c96e1845368a08c0c72e9d76f1?width=100 100w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F71cdb0c96e1845368a08c0c72e9d76f1?width=200 200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F71cdb0c96e1845368a08c0c72e9d76f1?width=400 400w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F71cdb0c96e1845368a08c0c72e9d76f1?width=800 800w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F71cdb0c96e1845368a08c0c72e9d76f1?width=1200 1200w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F71cdb0c96e1845368a08c0c72e9d76f1?width=1600 1600w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F71cdb0c96e1845368a08c0c72e9d76f1?width=2000 2000w, https:\/\/cdn.builder.io\/api\/v1\/image\/assets%2F48d1cdcd52ec4d289f1ef8c4f75da167%2F71cdb0c96e1845368a08c0c72e9d76f1?width=783 783w\" sizes=\"(max-width: 638px) 92vw, (max-width: 998px) 29vw, 56vw\"\u003e\u003c\/picture\u003e\u003cstyle data-emotion-css=\"7ojcyx\"\u003e\u003c\/style\u003e\n\u003cdiv class=\"builder-image-sizer css-7ojcyx\"\u003e \u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"builder-block builder-10c9b5ad5eb246118f149be795c2bf4d builder-has-component css-hgfgng\" builder-id=\"builder-10c9b5ad5eb246118f149be795c2bf4d\"\u003e\u003cspan class=\"builder-text css-1qggkls\"\u003e\u003ch3\u003e\n\u003cstrong\u003eDESIGN\u003c\/strong\u003e “Burst”\u003c\/h3\u003e\n\u003cp\u003eThe Astell\u0026amp;Kern SP4000T is a model within the flagship lineup that focuses on the very essence of analog sound. To realize the highest level of analog sensibility, Real Vacuum Tubes are applied in Quad configuration for the first time in a DAP, completing a deeply immersive analog sound that transcends the boundaries of digital players.\u003c\/p\u003e\n\u003cp\u003eThe SP4000T is the successor flagship to the SP4000, and its design concept keyword is \"Burst.\" Interpreting through formal language the moment when concentrated energy explodes outward from the center, the design gives visual form to the source of power from which sound erupts.\u003c\/p\u003e\n\u003cp\u003eThe structure tightly centered around the Volume Wheel expresses a sense of focused, tensioned energy, while the sculptural surface composition and contrast of light clearly convey the presence and physical weight of interaction. A design where mechanical precision and sculptural beauty coexist intuitively communicates a sense of 'power' through the fingertips. The Volume Wheel on the side is a defining element that symbolizes Astell\u0026amp;Kern's heritage — and the deep groove carved into its center symbolically represents the rich density of analog sound and the powerful driving energy of the device.\u003c\/p\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cstyle data-emotion-css=\"1n465md\"\u003e\u003c\/style\u003e\n\u003cimg src=\"https:\/\/cdn.builder.io\/api\/v1\/pixel?apiKey=48d1cdcd52ec4d289f1ef8c4f75da167\" aria-hidden=\"true\" alt=\"\" role=\"presentation\" width=\"0\" height=\"0\" class=\"builder-block builder-pixel-q6b7nc4syai css-1n465md\" builder-id=\"builder-pixel-q6b7nc4syai\"\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\u003c\/div\u003e\u003c\/builder-component\u003e\n\u003cscript async src=\"https:\/\/cdn.builder.io\/js\/webcomponents\"\u003e\u003c\/script\u003e","brand":"Astell \u0026 Kern","offers":[{"title":"Silver","offer_id":53553642930490,"sku":"sp4000t-sil","price":3620.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0834\/0245\/7402\/files\/Astell_Kern-SP4000T-Main-Temp-01.jpg?v=1781786539","url":"https:\/\/www.moon-audio.com\/products\/sp4000t-quad-tube-reference-dap","provider":"Moon Audio","version":"1.0","type":"link"}