Keeley Compressor Pro Professional Studio Compressor Pedal

Studio/Stage Compressor/Limiter with Hard- and Soft-knee Compression, Exact RMS Analysis, LED Display, Auto Mode, and True Bypass
4.5/5 5 Write review Item ID: CompressorPro
Keeley Compressor Pro Professional Studio Compressor Pedal image 1
Keeley Compressor Pro Professional Studio Compressor Pedal image 1
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Keeley Compressor Pro Professional Studio Compressor Pedal
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Use This Compressor On Anything

Delivering both hard- and soft-knee compression, the Keeley Compressor Pro is a stompbox-format compressor/limiter that works great onstage, but its superior frequency response and noise specs also make it a superb studio compressor that accepts a broad range of inputs from guitar and voice, to bass, keyboards, and drums. In live settings, the Compressor Pro helps you achieve polished, full-sounding performances while safeguarding your amps and speakers against overload. It's even great for maintaining professional sound levels for your podcasts and YouTube videos! At home, it's perfect for creating gobs of sustain at low volume. Take it from Sweetwater, the Keeley Compressor Pro will improve the sound of any instrument, in any situation.

Keeley Compressor Pro at a Glance:
  • Live or in the studio: your new best friend
  • Hard- or soft-knee: take your pick
  • Auto mode: concentrate on your performance
Live or in the studio: your new best friend

Keeley engineered the Compressor Pro for the broadest spectrum of input flexibility. The result is a stompbox-sized device that's perfect for studio, stage, and home use. With a huge range of adjustment from -50dBu to +10dBu, you'll be ready for anything. To put this into perspective, let's have a look some common audio signals. Pro audio (studio) levels are +4dBu; consumer audio levels are -10dBu. Passive guitar or bass pickups are generally in the range of -25dBu to 2.5dBu. So you see that the Keeley Compressor Pro has you covered, no matter what you need to compress.

Hard- or soft-knee: take your pick

The Keeley Compressor Pro supports both hard- and soft-knee compression, which is another key to its outstanding versatility onstage and in the studio. If you're looking for strong, limiter-like action, set the little chrome toggle switch on the left to "H" (hard-knee). In this mode, once the threshold is met, the Compressor Pro will compress at the the ratio you've set with the Ratio dial. No mercy. "Komfort Kompression" is what Keeley calls soft-knee. Set the toggle to "S," and you've got the ideal way to control your dynamics while keeping your compressed guitar or instrument part sounding natural, lively, and dynamic.

Auto mode: concentrate on your performance

Keeley's Compressor Pro sports an Auto mode - and this is your ticket to great performances. Set the chrome toggle switch on the right to On, and you've got automatic setting of your Attack and Release times. In most cases, Auto mode will sound natural and give you the dynamics control you need, while you attend to your performance. Under the hood, it works like this: the Compressor Pro looks at its input signal - be it guitar, bass, vocals, drums, etc., and derives the optimal attack and release times for what you're playing and the signal levels it's detecting.

Keeley Compressor Pro Features:
  • Perfect for stage, studio, and home use!
  • Accepts a huge range of input levels from -50dBu to +10dBu
  • Exact RMS Analysis (ERA) senses true RMS value of the input program material
  • Hard-knee compression for limiting or adding sustain
  • Soft-knee (Komfort Kompression) keeps performances lively and natural-sounding
  • Auto Mode provides program-dependent Attack and Release times
  • 7-segment LED display for fast, accurate compression/gain-reduction metering
  • Bi-color Threshold LED indicates when compression is initiated and released
  • True-Bypass circuitry - no signal degradation or gain loss when off
  • Handcrafted in Keeley's Oklahoma, USA factory
Onstage and in the studio, the Keeley Compressor Pro has you covered!

Tech Specs

Pedal Type Compressor
Inputs 1 x 1/4"
Outputs 1 x 1/4"
True Bypass Yes
Power Source 9V DC power supply required (sold separately)
Height 2"
Width 4.7"
Depth 3.8"
Manufacturer Part Number KCPro

Customer Reviews

Based on 5 reviews
Write your review

Keeley compressor pro

Great pedal enjoy it way more then even my Kealey 4 knob, let's face it everyone knows that pedal. It's a keeper, between both wet and dry and every other option you can obtain with an all in one, get it you will not be disappointed!

Awesome compressor pedal!

I've been playing guitar for over 40 years - live and in the studio; from 100W stacks and monster pedalboards to nothing more than a mic'ed 4W combo with compressor & volume pedal. Along the way, I've owned and used quite a few compressor pedals. The Keeley Compressor Pro is, hands-down, the best compressor pedal I've used to date. It's dead quiet, accurate, very versatile, and doesn't kill your tone. The Threshold LED and Compression LED meter provide good visual feedback, too. Those experienced with studio rackmount VCA, diode, and similar compressors, will feel right at home with the controls. In fact, the controls are more accurate than some studio compressors I've used. If you're not familiar with attack, release, etc., it's not rocket science. So a little time spent will go a long way to learning the nuances of the compressor. And, if you'd rather not mess with it, the "Auto" switch provides program-dependent control of attack & release. What's more, Robert Keeley and crew are very customer-oriented, personable, and provide top-notch customer support. So, rest assured, you won't be left hanging out in the breeze, should you encounter a problem with the unit. Lastly, I'm providing my feedback, based upon my unbiased, personal experience with this compressor, other Keeley pedals, and Robert Keeley Engineering. Something I believe the two previous reviewers can't say.

Best Pedal Compressor

Most Transparent compression pedal I've ever owned.

a necessity

a good starter comp for studio use.

Keely pro compressor

Not a bad comp, not a great one either, but does keep levels in check well enough. Not too transparently though. As it's a non tube based unit, it has some issues with fullness of tone/fidelity; but still sounds OK for the most part. So from a comp point of view it works well. From a tonal perspective, less so I think. The attack and release is less than transparent as well. Not ultra smooth in either direction imo. I also have an Effectrode PC-2A comp which IS a vacuum tube output, and it seems a better comp all the way around, but the Keely has it merits in variance of applied compression curves, over the Effectrode. If I had to choose, it would surely be the Effectrode. But the Keely what I'll use for practice, and save the tube in the Effectrode for performance needs. So the Keely can be a bit more economical perhaps, if you don't mind the attack/release being slightly visible. That would be it's only better point I think.
Music background: Recording Engineer/musician
See also: EQ Pedals, Keeley, Keeley Compressors and EQ