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Moon by Simaudio 400M Amplifier - EACH


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Extremely powerful, yet with a delicacy and articulation of the best amplifiers out there, the 400M Power Amplifier can take on virtually any loudspeaker you connect it to. Delivering a bottom-end slam, with authority and weight to the foundation of the music, it will transport you into a live concert environment. On the top end of the musical spectrum, the 400M delivers finesse, detail and refinement that can challenge your perception of reality vs. recorded music.

When used in conjunction with the 350P Preamplifier, the results are without equal. There isn’t a more refined combination at this price point. An ultimate combination for the discerning music lover, and for those who like to listen at higher sound levels.

Design features


  • Fully balanced differential circuitry.
  • Precision matched proprietary MOON Bipolar output transistors for improved bass response and accurate sonic reproduction.
  • An oversized power supply using a custom proprietary toroidal transformer design.
  • A high damping factor yielding superior musical dynamics, improved signal speed & refined timbre accuracy.
  • “Class A” output to 10 watts for greater efficiency.
  • Optimized selection of very high quality electronic components.




  • Output Power at 8Ω400 W
  • Output Power at 4Ω650 W
  • Input Sensitivity800mV RMS
  • Input Impedance47,500Ω
  • Gain36dB
  • Signal-to-noise Ratio106dB @ full power
  • Frequency response (full range)10Hz - 125kHz +0/-3dB
  • THD (20Hz - 20kHz @ 1 W)0.02%
  • THD (20Hz - 20kHz @ 400 W)0.05%
  • Intermodulation distortion0.02%
  • Shipping weight33 lb / 15 kg
  • Dimensions (width x height x depth)16.9 x 3.5 x 14.0 in