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Presonus ACP88 Compressor/Limiter/Gate

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Classic Dynamics Control

One of our all-time most popular products, the ACP88 delivers the classic analog compression that helped establish PreSonus as a leading signal-processor manufacturer. With eight independent, full-featured compressor/limiters and gates, the ACP88 can solve a host of thorny studio and live-sound problems.

Each channel provides a fully variable compressor with a sidechain send and return to enable spectral processing and ducking. In addition to the usual attack, release, ratio, threshold, and makeup gain controls, each compressor offers selectable soft- or hard-knee compression and an Auto Attack feature that overrides the manual controls and applies preset attack and release curves. A six-segment LED meter displays the amount of gain reduction.

The compressor/limiter is followed by a full-featured gate with attack, release, and threshold controls; a gate-range switch, which determines the amount of level reduction that occurs when the gate closes; and a sidechain/key insert loop that enables the gate to be opened, or "keyed," in response to a modified version of the program signal or some other external source.

Professional Features

With eight dynamics processors in one unit, you can employ tricks that aren't possible with lesser processors. The Channel Link feature lets you lock together as many channels as you wish, so that all processors follow the setting of the master processor. Since you can create multiple simultaneous link groups, you could link a stereo pair of channels plus a group of four processors and still have two unlinked channels for other applications.

Each channel can be independently bypassed so you can audition signals with and without processing. And since the ACP88 is designed to work smoothly with a variety of professional and semipro gear, you can select +4 dBu or -10 dBV operating levels independently for each channel.

Old Skool Rules

Some people say they don't make signal processors the way they used to. Nonsense. The ACP88 is a superb old-skool processor, with physical knobs and switches for every parameter, shoehorned into two rackspaces, and it delivers a pure analog sound that will always be in style.

So if you want a professional analog dynamics processor that is every bit as powerful and sonically pleasing as the famous vintage processors were "back when," try the ACP88. Because great sound never gets old.

  • 8 independent channels, each with:
    • Full-featured analog compressor/limiter
      • Attack, Release, Ratio, Threshold, and (makeup) Gain controls
      • Auto Attack button
      • Soft/hard knee switch
      • Sidechain send/return
      • 6-segment LED gain-reduction meter
    • Full-featured gate
      • Sidechain/key insert send/return
      • Attack, Release, and Threshold controls
      • Gate-range switch
    • Bypass switch
    • Channel Link button (can link multiple channels)
    • +4 dBu/-10 dBV operating-level switch
  • Input/Output
    • For each channel (x 8 channels):
      • 1 balanced 1/4" TRS line input
      • 1 balanced 1/4" TRS line output
      • 1 unbalanced TRS 1/4" compressor sidechain send-return
      • 1 unbalanced TRS 1/4" gate sidechain/key insert send-return
  • Physical
    • 2U 19" rack-mountable, super durable steel chassis
    • Internal power supply with standard IEC connector
Number of Channels Eight
Dynamic Range >115dB
Signal to Noise Ratio >95dB
Headroom +24dBu, Unbalanced
  +18dBu, Balanced
Frequency Response 10Hz to 50kHz
Crosstalk <82dB @10kHz
Compression Threshold Range -40dBu to +20dBu
Compression Ratio 1:1 to 20:1
Compressor Attack Time 0.02ms to 200 ms
Compressor Release Time 0.5ms to 500ms
Auto Attack and Release Program Dependent
Gate Threshold Range -70dBu to +20dBu
Gate Attack Time 0.01ms to 100ms
Gate Release Time 0.02ms to 2 sec
Gate Attenuation Range -15dB or -60dB
Input Impedance 10k Ohms
Output Impedance 51 Ohms
THD + Noise <0.02%
Output Gain -20dB to +20dB
Compression Curve Types Hard and Soft Knee
Compression Metering Above/Below Threshold LED
Gate Metering Open and Closed LED
Sidechain Output Impedance 51 Ohms
Sidechain Input Impedance 10k Ohms
Internal Operation Level +4dBu=0dBu
Input Range +4dBu or -10dBu
Input Connectors 1/4" TRS, Balanced or Unbalanced
Output Connectors 1/4" TRS, Balanced or Unbalanced
Compressor Sidechain Connector 1/4" TRS
Gate Sidechain Connector 1/4" TRS
Power Supply Internal, Linear Supply (factory configured)
Power Requirements 100V AC to 120V AC or 200V AC to 240V AC
Power Connection IEC Receptacle
Size 2U Rack
Dimensions 19" x 3.5" x 7"
Weight 12lbs.


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Presonus warrants its products to be free from defects for 1 year from the date of purchase.