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JDK Audio by API R22 Dual Channel Compressor

Two-channel stereo-linkable compressor/limiter from the makers of API
MFR# Dual Channel Compressor

Product Description

The JDK Audio R22 dual-channel compressor features two channels of API's patented award winning compressor circuit in a rack mount unit with internal power supply.  This is the same compressor circuit originally designed into all ATI Paragon mixing consoles.  Each channel includes the patented 'THRUST' switch to protect the sensitive high frequency content of the audio signal even under the most vigorous of compression ratios.  The perfect companion to your R20 mic-preamp and R24 EQ, the R22 compressor provides comprehensive easy-to-use control of the audio signal with custom VU metering of both output and gain reduction.  The two channels can even be linked for use as a stereo compressor with true RMS power summing of the left and right signals.


  • Patented thurst circuit
  • Variable threshold, ratio and make-up gain controls
  • Switchable metering of output level and gain reduction
  • Above threshold LED indication
  • Switchable hard or soft knee compression
  • Linkable for stereo operation with true RMS power summing
  • Fully balanced XLR and 1/4" inputs and outputs


  • Inputs: balanced XLR and 1/4" jack (1/4" normaled priority)
  • Outputs: balanced XLR and 1/4" parallel jacks
  • Input impedance: 15KOhms balanced
  • Bandwidth: +/- 0.5db, 20Hz - 50kHz
  • THD+N @ 1kHz, +4dBu: <0.005%
  • Maximum level: +19dBu
  • Signal-to-noise ratio: -88dBu (comp in), -92dBu (bypass), -106dB
  • Crosstalk: <84dB @ 20kHz
  • Stereo link: rrue RMS power summing
  • Meter: -20 to +3 VU output level, 0 to -15 dB gain reduction, switchable

Compressor Controls:

  • Threshold range: -40dBu to +15dBu
  • Ratio range: 1:1 to 10:1
  • Makeup gain range: 0dB to +20dB
  • Hard or soft knee switchabel
  • Flat or thrust side chain filter switchable
  • Attach time: program and control adaptive, 10mSec to 40mSec
  • Release time: program and control adaptive, 30mSec to 400mSec
  • Current: 93mA, 10.8VoltAmps

Product Specifications

Condition New
Tube or Solid State Solid State
Channels Dual-Channel
Chassis 19-inch Rack-mount
Rack Spaces 2u
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.