M ONE Twin All FET Discrete Class A Microphone Preamp & DI


We'd like to present our Twin All FET discrete Class A Microphone Preamp and DI. Design based on cascode topology with home-brewed transformers on Input and Output. Preamp has two cascades of amplification, first one is the main gain stage and the second one is the output booster. The Gain of Preamp controlled by the 12-step rotary switch reaches up to +70dB.

Output Volume control located between the first amplification stage and output booster. Two HPF 40 and 80 Hz passive LC filters provide great sonic behavior when engaged. The DI High-Z instrument input automatically activates if PL plug inserted, at the same time the XLR microphone input on back panel is disconnected. Both HPF can be used when the preamp is used as DI. All necessary Microphone Preamp functions such us -20dB pad, phase invention, +48V Phantom supply for condenser Microphone are controlled from the front panel.

The special about M One preamp is our transformer. We carefully collect all available knowledge form old masters, classic books and our own mistakes. As a result our transformers are superior sounding, which you will notice immediately. Our Microphone Input transformers utilize high grade 80% Ni-Fe alloy core with extremely low distortion.


  • All FET discrete, class-A mic preamplifier and DI
  • State of the art X-former IN X-former OUT
  • Tube-like sound
  • Gain and Level selection for maximum tonal variety
  • Twin-topology Mic Preamp & Hi-Z Instrument DI
  • Dual Gain Stages
  • Discrete JFET DI with 2.2 Mohm Ultra Hi-Z impedance
  • 70db+ of gain, +48 Phantom, Pad(-20dB), Phase Invert
  • Two passive High Pass filters, 40Hz and 80Hz
  • LED pick indicator
  • Rack-Mountable design for Studio, Desktop or Stage
  • Front Panel Hi-Z Input (switched from Mic automatically via Jack Detect)
  • Rear Panel XLR Mic Input and XLR Line Output
  • Universal Internal Power Supply
  • Heavy-Duty Metal Constructio
    Tehnical Specifications
  • All FET Discrete Microphone Preamplifier & DI Box
  • Inputs
  • Microphone (Female XLR)
  • Unbalaced Instrument (1/4" jack) DI on front panel
  • Output
  • Balanced Line (Mail XLR)
  • Mic Input Impedance
  • 300 ohms
  • Hi-Z Input Impedance
  • 2.2M ohms
  • Output Impedance
  • 600 ohms
  • Pad
  • -20dB
  • High Pass Filter
  • 40Hz or 80Hz passive
  • Frequency Response: Mic Frequency Response
  • 20Hz to 100kHz +/- 0.2 dBu
    Hi-Z Frequency Response
  • 20Hz to 100kHz +/- 0.2 dBu
  • Distortion
  • Min THD+Noise @ +4dBu 0.005%
  • Gain/Levels: Mic Range
  • 12 ~ 70 dBu
  • Maximum Mic Input Level Gain @ 1% THD
  • -7 dBu +8 dBu w/pad
  • Maximum Hi-Z Input Level Gain Min 1% THD
  • +8dBu
  • Maximum Output Level into 600 ohms
  • +23dBu
  • Maximum Outputs Level into 100 Kohm
  • +28dBu
  • Maximum Power Consumption
  • 160mA @120VAC 20W
  • Power Requirements
  • 100-240VAC

American customers can purchase this product from US distributor

zenpro-logo  From now USA customers able to purchase M ONE Preamplifier

  from  ZenPro Audio

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The price is not include your local VAT and Import Taxes

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