Apos SMSL-400 Ensemble

$1,424.99 $1,574.97

Dang it.

Unfortunately, the Apos SMSL-400 Ensemble has reached its end of life. Luckily, we have a great replacement in the TOPPING-90 Ensemble, which is similarly priced.

Apos Ensembles are equipment bundles that have been specially curated by our team of audio professionals. Just as an ensemble refers to a group of musicians playing together, each of our ensembles is a coordinated group of equipment that we’ve brought together to form a superior listening experience. 

Meet the SMSL-400 Ensemble

The stars of the SMSL-400 Ensemble are the SMSL M400 DAC and the SMSL SP400 headphone amp, an MQA-rendering duo that delivers up to 32-bit music with crystal clarity. An Apos Flow XLR cable connects them together with pure-copper clarity.

The SMSL-400 Ensemble includes:

Spec Summary

Note: For full specs, please visit the individual product pages.


  • THX AAA-888 Technology
  • Ultra-Compact design - great for desktop
  • Toggle switch for operation, input selection, and gain control
  • Balanced stereo headphone output
  • Balanced stereo line input
  • High precision resistors for temperature stability
  • Pop-less design with high quality relays
  • Selected high precision low-distortion volume potentiometer
  • Full protection with DC, over-voltage, over-current, and short-circuit
  • Thermal protection on headphone amplifier
  • High-efficiency ultra-low noise power supply
  • Output Power: 6W x 2 (16ohm), 3W x 2 (32ohm), 440mW x 2 (300ohm), 220mW x 2 (600ohm)
  • SNR: 130dB, A-Weighted
  • Output Noise: 2.8uV, A-Weighted
  • THD+N: -122dB, 0.00007% (1kHz, 32ohm)
  • THD+N: -117dB, 0.00013% (20 - 20kHz, 32ohm, -3dB)

SMSL SP400 THX AAA-888 Headphone Amp

    • THXAAA-888 Headphone Amplifier with THX AAA Technology
    • Ultra-compact design
    • Balanced stereo headphone output
    • Pre-amplifier application
    • Balanced stereo line input
    • Full function remote
    • 1.9” LCD display
    • SNR: 133dB, A-weighted
    • Output noise: 1.9uV, A-weighted
    • THD+N: -123dB, 0.00007% (1kHz, 32Ω)
    • THD+N: -117dB, 0.00013% (20-20kHz, 32Ω, -3dB)
    Apos Flow XLR Cable
      • Imported Japanese copper conductor
      • 4-core audio wire
      • A copper lattice braid with 94% density effectively shields the conductor from electromagnetic interference
      • Each core made of 60pcs of 0.08mm copper wire
      • Neutrik terminations
      Apos Ensemble

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