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JDK Audio R20 Two-Channel Microphone Preamp

Two-channel mic preamp

Product Description

The JDK Audio MP R-20 is a dual channel, high quality microphone preamp, designed from the ground up by API's design team to offer a versatile high quality input for Mmicrophones as well as instruments.

Each channel features both a mic and an instrument input, with switched phantom power, phase and pad.  Metering is traditional analog VU.


  • Dual mic preamplifiers with 54 dB of gain
  • Custom analog VU meters for monitoring output level
  • Front panel, high-impedance instrument input with 45 dB of gain
  • Peak indicator
  • Pad switch attenuates the microphone signal by 20 dB, or the instrument signal by 10 dB
  • Switchable 48v phantom power
  • Low distortion, low noise circuitry
  • Fully balanced output, both 1/4" and XLR

The MP-R20 provides two channels of premium analog microphone pre-amplification designed to provide a low noise, solid front end for all audio applications. Meticulously detailed and solidly constructed, the R20 features custom analog VU meters and hands-on analog control of the gain level.  Individual toggle switches control the selection of 48v, polarity, pad and a mic/instrument switch.


  • Inputs: Balanced XLR mic jack (rear) Un-balanced 1/4" instrument jack (front)
  • Outputs: Balanced XLR and 1/4" parallel jacks
  • Microphone Input
    • Gain: +55db (no pad), +36db (w/pad)
    • Min Gain: +9db (no pad), -10db (w/pad)
    • Pot gain range: 46db
    • Pad: -20db
    • Input impedance: 6.8K Ohms
    • THD+N @ 1Khz, +4dbu: 0.013%
    • Bandwidth: +/- 0.5db, 20hz - 50Khz
    • THD+N @ 1Khz, +4dbu: 0.013%
    • Maximum level: +20dbu
    • Signal-to-noise ratio: -90db
  • Instrument Input
    • Max gain: +31db (no pad), +21db (w/pad)
    • Min gain: +10db (no pad), 0db (w/pad)
    • Pot gain range: 21db
    • Pad: -10db
    • Input impedance: 500K Ohms
    • Bandwidth: +/- 0.5db, 20hz - 20Khz
    • THD+N @ 1Khz, +4dbu: 0.002%
    • Maximum level: +20dbu
  • Signal-to-noise ratio: -80db
  • Current: 65mA, 7.3 VoltAmps
  • Dimensions: 2u EIA 19" rack
  • Height: 3.5"
  • Width: 19"
  • Depth: 10"
  • Weight: 12 lbs

Product Specifications

Condition New
Tube or Solid State Solid State
Channels Dual-Channel
Chassis 19-inch Rack-mount
Rack Spaces 2u
Direct Input Yes
Digital I/O No

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I would like to thank VK for the wonderful sales assistance, service and prices. This was my first purchase with you and it won't be my last. I only wish I'd discovered you years ago!
Matthew R.
I had two Grammy wins this year - Ray LaMontagne & Carolina Chocolate Drops. Both made with help from Vintage King!
Ryan F.
In almost 20 years in Pro audio buying, never did I receive a unit so well packed and exactly as described. Works flawlessly. The whole process has been so smooth. I will never hesitate to do business with you guys in the future and will recommend you to everyone I know.
Martin C.
This was my first experience buying something from Vintage King (although I surf the "used" categories on the website frequently!), and, despite being on the other side of the world, I had absolutely no trouble and everything went very smoothly.
Phil T.