Moon 850P Preamplifier

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The MOON 850P is the most advanced MOON preamplifier to date. Extensive research and development, coupled with recent advancements in electronic parts, have provided us with the foundation to design what may very well be the quietest, most accurate and uncolored preamplifier. 

uTargeted to the discerning listener who desires uncompromising musical reproduction, the 850P features numerous proprietary technologies such as our new M-Octave Damping damping system that eliminates the sonically degrading effects of microphonics by mounting the main audio circuit on an 8-point floating suspension. The result is a more natural, liquid and lifelike sound. Since listening environments are typically loaded with acoustically induced vibrations that originate from the loudspeakers, Moon use M-Octave to isolate the MOON 850P from these microphonic-causing vibrations, allowing you to hear more music, exactly the way it was recorded.


  • 2-chassis design with 1 chassis housing the power supply, digital controller circuitry, software processing & the LED display. The other chassis contains ONLY audio circuitry.
  • Power supply voltage regulation includes i 2 DCf (Independent Inductive DC Filtering); 1 inductor for each and every IC in the audio circuit’s signal path – 40 stages in all.
  • Gain offset adjustment of ±10dB for each line input.
  • Each line input is fully configurable to be “home theatre ready”, whereby the 850P’s volume control is bypassed.
  • Number of inputs - XLR / RCA: 3 pairs / 5 pairs
  • Input Sensitivity: 200mV - 4.0V RMS
  • Input Impedance: 11,000Ω
  • Gain: 9dB
  • Number of Outputs - XLR / RCA: 2 pairs / 2 pairs (fixed + variable)
  • Signal-to-noise Ratio (20Hz-20kHz): 130dB @ full output
  • Frequency response: 5Hz - 100kHz ±0.1dB
  • Crosstalk @ 1kHz: -130dB
  • Output impedance: 50Ω
  • THD (20Hz - 20kHz): 0.0005%
  • Intermodulation distortion: 0.0001%
  • Shipping weight: 151 lb / 67 kg
  • Dimensions - each chassis (w x h x d): 18.75 x 4.0 x 16.5 in / 47.6 x 10.2 x 41.9 cm