The ultimate analog preamplifier

“It’s the most transparent preamp – or audio component of any sort – that I’ve heard.”
– Brian Damkroger, Stereophile

Our most advanced preamplifier to date

“This is a rare component in the way it disappears, revealing nothing but the music carried through it. I’ve yet to hear one that reveals more music.”
– Jeff Dorgay, TONEAudio

Sophisticated two chassis design

The audio circuits are isolated within a second box for better signal accuracy.

Suspension for complete microphonic annihilation

giving incredibly lifelike natural sound.


Product features
In the box
User manual
Comparison chart
Design features
  • 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 theater 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
  • Gain
  • 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
  • Output impedance
  • THD (20Hz - 20kHz)
  • Intermodulation distortion
  • 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
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