Astell&Kern SEM4 Amplifier Module for SE180 Astell&Kern

Shape Your Sound With SEM4
SEM4 is an Interchangeable All-in-One module for the SE180. With its release, Astell&Kern has expanded the potential of the SE180 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 minimises 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.

Equipped With Asahi Kasei AK4493EQ Dual DAC
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 utilises 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.

Supports Native DSD512, 32-bit/768kHz
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.

Digital Audio Remaster Technology for Even More Vivid, Original Sound
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.

Advanced New Generation AMP Technology
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.

System Unit and Module Circuit Separation Structure
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.

TERATON ALPHA, The Pinnacle of AK Audio Technology
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.