Astell&Kern SEM2 Amplifier Module for SE180


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  • Shape your Sound with SEM2
    SEM2 is an Interchangeable All-in-One module for the SE180 Shape your Sound with the Asahi Kasei AK4497EQ Dual DAC SEM2 Give your SE180 a different sound than the bundled module SEM2 supports up to 32bit/768kHz / Native DSD512.

    Next Generation Advanced AMP Technology
    Next generation AMP technology is also applied in the SEM2 all-in-one module. From the selection of OP-AMP parts, to circuit design, board layout and tuning, everything has been completely redesigned to produce the best sound. Even with a high output, the signal-to-noise (SNR), one of the important measurements of audio performance, boasts an amazing 127dB (based on AK4497EQ Dual, Balanced, High Gain).

    Circuit Separation Structure of Main Body and Module
    By physically separating the main body from the All-in-One module, we completely block power and RF noise that may occur from the main body. This creates an independent structure that prevents noise from interfering with music playback. Balanced and unbalanced signals are separated for each channel to provide the best possible sound through independent circuit design without interference.

    Astell&Kern Audio Technology Forms the TERATON ALPHA Sound Solution
    TERATON ALPHA is AK's ultimate Sound Solution to produce audio playback that is close to the original sound through the audio output interface by use of effective power noise removal, efficient power management and amplification with minimal distortion. TERATON ALPHA features Astell&Kern's patented technologies, which are the result of tens of thousands of hours of continuous research and development to produce sound close to the original sound the artist and producer intended.

  • • TERATON ALPHA Sound Solution technology for improved audio
    • New Generation AMP Technology
    • Up to 32bit / 768kH / Native DSD512
    • AKM AK4497EQ Dual DAC

  • General Specifications
    Product Name SEM2
    Model PAP12
    Body Material Aluminum, Stainless Steel, Polycarbonate
    Body Colour 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
    Outputs 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 AK4497EQ 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]
    Weight 3.53oz (100g)
    Operating Temperature 0°C- + 40°C (32°F - 104°F)
    Playback Time about 10.5hours (FLAC, 16bit, 44.1kHz, Vol.50, LCD Off)
    Audio Performance
    Frequency Response ±0.07dB (Condition : 20Hz-20kHz) Unbalanced /
    ±0.06dB (Condition : 20Hz-20kHz) Balanced
    ±0.068dB (Condition : 20Hz-70kHz) Unbalanced /
    ±0.067dB (Condition : 20Hz-70kHz) Balanced
    Signal to Noise Ratio [Normal Gain] 122dB @ 1kHz, Unbalanced / 124dB @ 1kHz, Balanced
    [High Gain] 125dB @ 1kHz, Unbalanced / 127dB @ 1kHz, Balanced
    Crosstalk [Normal Gain] -138dB @ 1kHz, Unbalanced / -145dB @ 1kHz, Balanced
    [High Gain] -138dB @ 1kHz, Unbalanced / -147dB @ 1kHz, Balanced
    THD+N [Normal Gain] 0.0006% @ 1kHz, Unbalanced / 0.0005% @ 1kHz, Balanced
    [High Gain] 0.0008% @ 1kHz, Unbalanced / 0.0006% @ 1kHz, Balanced
    IMD SMPTE 0.0002%, 800Hz 10kHz (4:1), Unbalanced / 0.0002%, 800Hz 10kHz (4:1), Balanced
    Output Impedance 3.5mm (1ohm) / 2.5mm (1.5ohm) / 4.4mm (1.5ohm)