Keeley GC-2 Limiter/Compressor

Keeley Compressor GC-2 Limiting Amplifier

The Keeley Compressor GC-2 Limiting Amplifier delivers professional-grade compression and limiting technology for musicians and compressor enthusiasts of all kinds.

Precision Compression

The Keeley Compressor GC-2 Limiting Amplifier provides true high-fidelity compression and limiting. Built around the exotic and extremely high-fidelity THAT Corp. 4320, it is a musical studio-grade compressor in stompbox format! It uses high-performance Voltage Controlled Amplifiers, onboard true-RMS detector, and ultra-high performance op-amps to bring you the very best quality. This type of compressor gives you precise control and very musical results, making it well suited for guitar, keyboards, drum machines, and more. The Keeley GC-2 Limiting Amplifier is both musical and transparent, handling astonishingly large signals with an incredible bandwidth of over 20 KHz. No detail in your guitar's tone will be lost. The Keeley GC-2 will be a sound investment in your tone - you now have genuine rack-mount quality at your feet.

Compression and Threshold

Using the Keeley Compressor GC-2 as a limiting amplifier saves your speakers from clipping and distortion. Set the Threshold to look for peaks in your signal and limit distortion from your amplifier or damage to your speakers. The Threshold Indicator light helps you see what type of playing you want to limit. Next, set the Compression Ratio Control to determine how much squash you want when the signal is above Threshold. Set Compression all the way down (1:1) for no compression and use the Gain control as a boost. Set Compression all the way up for an above-Threshold, hard-knee limiter.

Attack and Release

There is a certain figure that just sounds good as far as compression goes, and that's 125 dB/second. With feed-forward compressors that use this type of true-RMS detector, you use a single time-constant parameter. The timing capacitor gives you attack and release times that are adaptive to your playing level or the signal input to the compressor. Bottom line: Attack and Release times vary on program content. Attack times are, generally speaking, about 100 times faster than release times.

• Attack Time : typically 15ms for 10dB, 5ms for 20dB, 3ms for 30dB
• Release Time : typically 8ms for 1dB, 40ms for 5dB, 80ms for 10dB, 160ms for 20dB, 240ms for 30dB

Tone Control and Blend

• Tone Control and Blend : None. The Keeley Compressor GC-2 maintains high-end treble response with its ultra-slick, feed-forward compression design, so there is no need for additional tone controls or blend controls, which can add noise to the compressor circuit.

Specifications

• Voltage Input : 9.6V
• Current Draw : 15mA
• Input Impedance : 1 Meg ohm
• Output Impedance : 100 ohm

In summary, the Keeley Compressor GC-2 Limiting Amplifier offers high-quality, transparent compression and limiting for a wide range of musical applications. Its precision control and high-fidelity components make it an essential tool for achieving professional sound.