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Pass Labs INT-250 Stereo Amplifier Front
Pass Labs INT-250 Stereo Amplifier
Pass Labs INT-250 Stereo Amplifier Back
250 watts per channel, driving the most powerful speakers with ease. More details
Pass Labs INT-250 Stereo Amplifier Front
Pass Labs INT-250 Stereo Amplifier
Pass Labs INT-250 Stereo Amplifier Back
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The Pass Labs INT-250 Stereo Amplifier is a powerhouse of audio engineering that sets a new standard for sonic excellence. The INT-250 is a reference-level integrated amplifier designed to deliver 250 watts per channel into 8 ohms, showcasing Pass Labs' renowned Class A/B topology for exceptional sound quality. Its symmetrical circuitry and meticulously selected components ensure precise and transparent audio reproduction, revealing the finest nuances in your music. Equipped with a built-in preamplifier section, the INT-250 offers versatile connectivity options including balanced (XLR) and single-ended (RCA) inputs. With its dual-mono construction, robust power supply, large heat sinks, and minimalist, elegant design, the Pass Labs INT-250 is the ultimate expression of audio refinement for the most discerning audiophiles.
Dragon Cable Recommendation: we recommend pairing the X250.8 stereo amplifier with our award-winning Silver Dragon Interconnects. The Silver Dragon Interconnect is one of our best-selling cables at Moon Audio. Sold in Pairs, it is our top-of-the-line silver conductor-based interconnect. With a braided geometry and amazing shielding, this interconnect is a remarkable solution where noise isolation is key. The Blue Dragon Power Cable is also recommended to provide the cleanest and unbridled power to your high-end amplifier.
The Pass Labs INT-250 Stereo Amplifier is packed with features that define its exceptional performance:
Drawing from the same synergies developed in the .8 series power amplifiers, the Pass Labs INT-250 shares a similar pedigree with the INT-60. However, the INT-250 sets itself apart by delivering a commanding 250 watts per channel of pure listening pleasure. This increase in power is made possible by higher power MOSFETs and a greater quantity of them, allowing the INT-250 to effortlessly drive large, demanding, and relatively inefficient loudspeakers with ease. Whether at moderate levels or higher volumes, the INT-250 maintains its composure, delivering beautifully rendered music that is both powerful and nuanced. It's remarkable how this single component can breathe life into your entire music collection, delivering an incredible sonic experience that captivates the senses.
Pass Labs and First Watt were founded by hi-fi legend Nelson Pass. After co-founding and later selling Threshold Audio, Pass began working out of his Auburn, California, home in the early 1990s to develop prototypes of single-ended Class A amplifier designs under the name Pass Labs. Pass Labs quickly became known for its commercially produced Aleph, X, and XA Series amps, and preamps. Pass later started First Watt as a passion project focusing on low-power amps for a niche audiophile audience. Today, Pass splits his time between the two companies, with production happening in Pass Labs' facility in Foresthill, California.
What is the power output of the Pass Labs INT-250 Stereo Amplifier?
The Pass Labs INT-250 Stereo Amplifier delivers 250 Watts per channel into 8 ohms. This substantial power output ensures dynamic and authoritative performance with a wide range of speakers, even those with demanding impedance curves or low sensitivity. The INT-250 is designed to drive speakers with precision and control, delivering exceptional sound quality across the frequency spectrum.
What distinguishes the Pass Labs INT-250 from other stereo amplifiers?
The Pass Labs INT-250 is renowned for its combination of power, precision, and musicality. It features a high-current, Class A/B output stage for robust and dynamic performance, along with a fully balanced input stage for exceptional signal integrity. The INT-250 also incorporates Pass Labs' advanced power supply design and meticulous circuitry layout, resulting in low distortion and outstanding sonic purity. Its versatile design and high power output make it suitable for a wide range of audio systems and speaker setups.
Can the Pass Labs INT-250 handle difficult speaker loads?
Yes, the Pass Labs INT-250 Stereo Amplifier is designed to drive a variety of speakers, including those with challenging impedance characteristics or low sensitivity. Its high-power output, combined with its stable and high-current design, enables it to handle demanding speaker loads with ease. Whether driving efficient bookshelf speakers or large floor-standing models, the INT-250 delivers authoritative and controlled sound reproduction across the entire volume range.
Does the Pass Labs INT-250 require any special considerations for setup or maintenance?
The Pass Labs INT-250 Stereo Amplifier is designed for ease of setup and reliable operation. It does not typically require bias adjustments, as it is a self-biasing Class A/B design. However, users should ensure proper ventilation to dissipate heat generated during operation, as the INT-250 can produce significant thermal energy at higher power levels. Adequate airflow around the amplifier will help maintain optimal performance and prolong its lifespan. Additionally, users should follow Pass Labs' recommendations for safe and appropriate operation.
Who is Nelson Pass?
Nelson Pass, the man behind Pass Labs and First Watt, has been designing and building amplifiers for decades. His early passion, however, was speakers; at age 14, he started assembling loudspeakers. As a college student studying physics at the University of California-Davis, he co-founded a speaker company called PMA. He also worked for ESS, where he designed crossovers and enclosures. After college, with his interest having shifted toward amplifiers, Pass co-founded Threshold Electronics (now Threshold Audio). His achievements during the Threshold years include developing the first dynamically biased Class A amplifier circuit; developing a fully cascode audio power amplifier; and developing the STASIS stereo preamplifier and power amplifier. During the 1980s, Pass designed the Adcom GFA-555 amplifier. Later, after selling Threshold, he started Pass Labs in 1991 and First Watt in 1997. Pass holds several patents related to audio circuits.
How did Pass Labs make its name?
Pass Labs helped popularize solid-state, Class A power amplifiers. Pass Labs' first product, the Aleph 0 amplifier, operated as single-ended Class A up to its 70 watt rating and in push pull Class A at higher wattage. The Aleph series of amplifiers, some of the first solid-state amps that were said to be "tube-like" in sound, operated pure class A and contained internal circuitry using MOSFETs. The Aleph amplifiers had a unique appearance, a cube with heat sinks on all four sides, a solution to the heat generated by the class-A design. This can be attributed primarily to the specific MOSFETs used and the minimum number of gain stages that were implemented in the design. Pass Labs also developed the Super-Symmetry™ ("Su-Sy") circuit, which achieves exceptionally low distortion and noise levels. In 1998, Pass Labs released the X1000, the first amplifier using the patented SuperSymmetric™ topology. The X1000 achieved 1000 watts with high performance, local feedback and only two gain stages: a cascoded differential pair of transistors and a large bank of complementary output followers. This groundbreaking design informed all subsequent Pass Labs amplifiers.
What else does Pass Labs make?
In 2002, Pass Labs unveiled the first XA amplifiers, combining the X and Aleph topologies into balanced single-ended Class A amplifiers with many of the characteristics of both the X and Aleph series. The current Pass Labs lineup includes Class A amps (XA and Xs Series), Class AB amps (.8 Series), line preamps (Xs and XP Series), phono preamps (Xs and XP Series), integrated amps (INT Series), and one headphone amp.
What is the relationship between Pass Labs and First Watt?
When he started Pass Labs, Pass did everything out of his home. In 1997, having outgrown the space, Pass Labs moved into commercial space in Foresthill, California. When Pass started First Watt, it was a "kitchen table" venture, with work once again happening in his home. In 2016, with production demands not leaving him enough time to pursue the vast array of yet-to-be-designed amps, Nelson handed the business end of First Watt over to Pass Labs. Pass Labs took over the building of First Watt amplifiers as well as marketing and distribution. There's a synergy between the two operations, in that Pass Labs gets to gather up some of the more interesting First Watt finds and repurpose them as more commercially viable designs. Today, Pass splits his time between First Watt and Pass Laboratories.
| Class | AB |
|---|---|
| Type | Stereo |
| Gain (dB) | 30/36 |
| Volume control (1dB steps) | 63dB |
| Remote | yes |
| Inputs | 4 |
| Outputs | 2 |
| Power Output /ch (8 ohm) | 250 Watt |
| Power Consumption (W) | 450 |
| Standby Power Consumption (W) | <1 |
| Dimensions (W x D x H) | 19 x 21.25 x 9.1 |
| Weight (LBS) | 105 |
