PreSonus ACP88 8 Channel Compressor Gate

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    Product Description

    The ACP88 gives you total dynamics control for multi-tracking and live sound reinforcement. Eight compressor/limiters deliver transparent dynamics control. Eight full featured gates seamlessly control unwanted noise and bleed-through. Control vocals, tame drums, protect speakers, tighten the low-end – all from just two rack spaces of powerful processing.


    • Eight Full Featured Compressor/Limiters
    • Eight Full Featured Gates
    • Side Chain on Every Channel
    • Trigger Inputs on Every Channel
    • Balanced/Unbalanced I/O
    • Comprehensive Linking via Unique Power Summing Bus
    • Takes the Place of Multiple Processors
    • Crystal Clear Compression & Gating for Multi-Tracking & Live Sound
    • Allows Spectral Processing & Gate Keying via Separate Jacks
    • +4/-10 Stereo Operating Level

    The ACP88 is an eight-channel dynamics processor designed to provide compression, limiting, and noise gating in a variety of applications; such as multitrack recording, live sound reinforcement, broadcast and permanent sound installations. Value for the dollar is unmatched. Quality is uncompromised. Thousands of these units are in use around the world. The best names in the business depend on this unit. We think you will too!

    Each channel on the ACP88 provides crystal clear, musical compression and is equipped with full-featured controls including variable attack and release and switchable soft/hard knee. Also, an “Auto” mode on every channel takes the guesswork out of setting the compressor. The noise gates are excellent for cleaning up drums, vocals, and instruments. Gate feature set includes; threshold, variable attack & release times and gate range controls. The Gate boasts a Gate Key/Sidechain for precise frequency gating applications. In addition, each channel has a seven-segment LED meter that displays gain reduction, and an LED indicator for gate position (open/close) and compression threshold (above/below). A unique linking function makes it possible for any channel to be linked to the previous. This comprehensive bus can link two to eight channels together in any order as well as create various link groups. De-essing, ducking and other forms of spectral processing can be accomplished using the compressor Sidechain provided on every channel.

    At the heart of the ACP88 is the much respected THAT 4301s VCA. This VCA has unsurpassed dynamic range, extremely low distortion charateristics and virtually no noise. Conclusion? There is nothing that can compare to the space/performance benefits of the ACP88 at any price.

    All inputs and outputs are 1/4” TRS balanced or unbalanced, and each channel has a selectable +4dBu/-10dBV switch. The unit is housed in a two-rack-space, all-steel chassis and has a switchable power transformer for international use. With its superior sound quality and features, the ACP-88 is a workhorse-processor that truly affords Total Dynamics Control.

    ACP88 Basic Setup & Applications

    • Use on your mixer’s insert points
    • Use after your mixer’s main outputs, balanced
    • Use between multitrack recorder inputs/outputs to mixer outputs/inputs, unbalanced
    • Sidechain insertion of an equalizer, for de-essing, ducking, and frequency dependent gating
    • Prevent tape saturation & distortion
    • Control wide swings in mic & instrument levels
    • Protect speakers and other system components
    • Transfer between digital and analog formats
    • Optimize valuable rack space and performance

    Product Specifications


    • 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
    • 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

    ACP88 Architectural & Engineering Specifications
    The compressor/limiter/gate shall have eight identical channels, each with an audio frequency response of 10Hz to 50kHz, an electronically floating balanced input impedance of not less than 10k Ohms, balanced and a maximum input level of not less than +24dBu unbalanced and +18dBu balanced, into a minimum load impedance of 51 Ohms and 1/4" TRS type connectors. The unit shall also have a compression sidechain with an input impedance of not less than 10k Ohms and an output impedance of not less than 51Ohms. Sidechain input/output jack shall be a 1/4" TRS jack. Total Harmonic Distortion plus Noise shall be less than 0.02%. The unit shall have an Equivalent Input Noise level of not more than -96dBu unweighted, and a dynamic range of not less than 115dB. Ouput gain adjustment shall be variable from -20 to +20dB. The compression threshold range shall be variable from -40 to +20dB and the compression ratio shall be variable from 1:1 to infinity:1. The compressor attack and release times shall be selectable for either program dependent or manually adjustable, scalable operation. The compression ratio characteristic shall be selectable for either the hard or soft knee curve type with a maximum compression of no less than 40dB. The noise gate shall have a threshold of - infinity to no less than +20dBu. The gate attack time shall be variable from 10 microseconds to no more than 100 milliseconds. The gate release time shall be variable from .02 to no more than 2 seconds. The gate range shall be preset for either -60dB or -20dB reduction. All input, output and sidechain signals shall be via the rear panel. The stereo link shall be of the true RMS summing type with the previous unlinked channel as the master when linked. The unit shall have the following front panel switches for each channel: Soft/Hard knee, auto, link, range and bypass. Each channel shall have the following identical controls: Compressor threshold, compressor ratio, compressor attack, compressor release, gate threshold, gate attack, gate release, and channel gain make up; and the following identical metering and indicator LEDs for each channel: Below/Above compressor threshold, compression gain reduction, gate open/close, and link engaged/disengaged. There shall be a rear panel switch for each channel to select nominal input and output operation levels at 10dBV or +4dBu. The power requirements shall be 100-120-VAC 50/60Hz or 200-240VAC, 50/60/Hz, 20W via a detachable IEC type AC cable. The size of the unit shall be19" X 3.5" X 7" and a weight of 10lbs. (4.54kg). The 2U high, full rack width eight channel compressor/gate shall be a PreSonus ACP-88.


    ACP88 FAQ
    from PreSonus
    Q Hi. I have a quick question regarding the ACP88 and how I can use it with my current PA system. My mixer is the digital Yamaha O1V. As you probably know, this type of board doesn't have insert channels. So I'm wondering if I can send my mics straight into the ACP88, use the compression/gate/limiter functions and THEN go into the board. In other words, does the ACP88 function properly if it is used before the mic preamp?

    A The ACP88 will not work before the mic preamp of your console because it is a line level device only and plugging a microphone into it will require a mic level input. You will have to either run external mic preamps before the ACP88 or come into it from a line level source like an aux send or a subgroup.

    We have had customers use one of our M80 eight-channel mic preamps in front of the ACP88 and then into the line inputs of digital consoles and that works great. While the M80 will improve the sound you are getting from stock mixer preamps, I realize this may or may not be cost effective for you.


    Q What is the feature/sonic difference (improvement) from the ACP8 to the ACP88?

    A The biggest changes to the ACP88 were in the gate circuit. The ACP8 had a FIXED ATTACK (gate opening) timing of 50 microseconds and a VARIABLE RANGE attenuation knob. On the ACP88 we scrapped the VARIABLE RANGE in favor of VARIABLE ATTACK TIME (10 microseconds to 100ms) and put the RANGE ATTENUATION control on a two position switch ( -60dB or -20dB). The result is a gate that performs better on a variety of applications because of the ability to slow down the opening time. On the back we added a SIDECHAIN for the gate instead of just the gate KEY. This allows for frequency triggered gating by inserting an equalizer.


    Q I purchased an ACP88 and the only thing that is not clear to me is the +4/-10dBu button on the back. What is the difference between "pro levels" and "line levels"?

    A +4 and -10 refer to operating levels. +4 is considered "pro" and -10 is often considered consumer level. An operating level indicates what a zero reading on a meter equals. On a VU meter that is on a device set up to operate at -10, a reading of zero on the meter indicates an output level of -10 db. A +4 system at zero on the meter is actually putting out 4 db of signal. In a +4 system, .775 millivolts across 1 watt causes a reading of zero on the meter. This is how the meter is calibrated. If you are using the ACP at the inserts of a channel of a mixer, the usual level is -10. You should check the manual of the device you are using your ACP 88 with to ascertain the o-operating level of the device and adjust the 88, accordingly. If you are unsure, the -10 setting on the 88 outputs and handles lower level signals than the unit would were it set to operate at +4.


    Helpful Info about the Manufacturer
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