SEM4 is an Interchangeable All-in-One DAC module for the SE180 Digital Audio Player. With its release, Astell & Kern has expanded the potential of the SE180 music player once again. SEM4, born from the key concept of "Shape Your Sound," is equipped with the AK4493SEQ dual DAC, the latest DAC from Asahi Kasei, which minimizes loss and noise interference from the original sound while offering 14 hours of playback performance — the longest among SEM modules.
SEM4 supports up to 32-bit/768kHz, Native DSD and you will be able to enjoy even more vidid, original sound with the introduction of digital audio remaster (DAR) technology.
The SEM4 module is equipped with a dual AK4493SEQ DAC, the latest product from Asahi Kasei, which has been implemented in an Astell&Kern product for the first time worldwide.
The AK4493SEQ DAC is a premium DAC that utilizes AKM's VELVET SOUND™ technology to play natural sounds with even lower noise and distortion, offering the best low distortion traits and a wide dynamic range.
With technology such as the advanced switch and capacitor that is created to achieve low-power consumption, it provides amazing play performance and low noise for 14 hours of playback, the longest among SE180 modules..
SEM4 supports Native DSD512 and up to 32-bit/768kHz with Astell&Kern's excellent audio technology, allowing you to fully enjoy your favorite music.
SEM4 features digital audio remaster (DAR) technology — the first time the technology has been applied in an Astell & Kern product.
DAR technology is developed to upsample the sample rate of the sound source being played to go beyond the limits of the source format.
The high sample rate allows more refined play and offers delicate and analog-like original sound, helping you to enjoy the richness of the original sound, subtle differences in the nuance of the music and rich sounds at a higher level.
*The DAR function can be turned on and off and you may select it to suit the source sound and your own preferences.
*Max PCM rate 384kHz/DSD256 conversion play is supported, and the files will be converted to and played in the sample rates that fit the source sound.
|DAR Option||Maximum Conversion Rate|
44.1kHz range PCM will be converted to 352.8kHz for playback.
48kHz range PCM will be converted to 384kHz for playback.
No conversion will be made when playing DSD with this option selected.
PCM files below 96kHz will be converted to DSD128 for playback.
PCM files above 96kHz will be converted to DSD256 for playback.
DSD files below DSD256 will be upconverted to DSD256 for playback with this option selected.
The SEM4 also features Astell&Kern’s new generation AMP technology.
From the selection of the OP AMP parts to placement, circuit design and tuning, it has undergone a complete transformation without anything left behind.
The complete physical separation of the system unit and the DAC module perfectly prevents noise from the power and RF noises from the system unit, meaning no noise will interrupt your music.
In addition, the separation of signals by balanced and unbalanced channels with no interference delivers the ultimate sound.
AK ULTIMATE SOUND SOLUTION, TERATON ALPHA
TERATON ALPHA is AK's unique ultimate sound solution that gets as close as possible to the original sound through effective power noise removal, efficient power consumption, unwavering amplification and a perfectly converted audio output interface.
It features TERATON ALPHA, which has been created with the patented technologies of Astell & Kern, and is the fruit of tens of thousands of hours of research and development in the pursuit of sound that is close to the original.
|Body Material||Aluminum, Stainless Steel, Polycarbonate|
|Body Color||Moon Silver|
|Sample Rate||PCM : 8kHz ~ 768kHz (8/16/24/32bits per Sample) / DSD Native: DSD64(1bit 2.8MHz), Stereo / DSD128(1bit 5.6MHz), Stereo / DSD256(1bit 11.2MHz), Stereo / DSD512(1bit 22.4MHz), Stereo|
|Output||Unbalanced Out (3.5mm), Balanced Out (2.5mm, only 4-pole supported / 4.4mm, only 5-pole supported)|
|Output Level||[Normal Gain] Unbalanced 2Vrms / Balanced 4Vrms (Condition No Load) [High Gain] Unbalanced 3Vrms / Balanced 6Vrms (Condition No Load)|
|DAC||AKM AK4493SEQ x2 (Dual DAC)|
|Decoding||Support up to 32bit / 768kHz Bit-to-Bit playback|
|Dimensions||3.03"(77mm)[W] x 2.99"(76mm)[H] x 0.78"(19.9mm)[D]|
|Operating Temperature||0°C ~ +40°C (32°F ~ 104°F)|
|Playback Time||about 14 hours (FLAC, 16bit, 44.1kHz, Vol.50, LCD Off)|
|Frequency Response||±0.09dB (Condition : 20Hz~20kHz) Unbalanced / ±0.048dB (Condition : 20Hz~20kHz) Balanced / ±0.65dB (Condition : 20Hz~70kHz) Unbalanced / ±0.65dB (Condition : 20Hz~70kHz) Balanced|
|Signal to Noise Ratio||[Normal Gain] 121dB @ 1kHz, Unbalanced / 121dB @ 1kHz, Balanced [High Gain] 125dB @ 1kHz, Unbalanced / 125dB @ 1kHz, Balanced|
|Crosstalk||[Normal Gain] -134dB @ 1kHz, Unbalanced / -138dB @ 1kHz, Balanced [High Gain] -135dB @ 1kHz, Unbalanced / -143dB @ 1kHz, Balanced|
|THD+N||[Normal Gain] 0.0003% @ 1kHz, Unbalanced / 0.0004% @ 1kHz, Balanced [High Gain] 0.0005% @ 1kHz, Unbalanced / 0.0006% @ 1kHz, Balanced|
|IMD SMPTE||0.0003%, 800Hz 10kHz (4:1), Unbalanced / 0.0003%, 800Hz 10kHz (4:1), Balanced|
|Output Level||3.5mm (1ohm) / 2.5mm (1.5ohm) / 4.4mm (1.5ohm)|