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The Keeley C4 4-Knob Compressor is a studio-grade stompbox based on the Ross Compressor circuit with added external controls for input gain and attack. It uses metal film resistors and capacitors plus hand-matched transistors for low noise and clean compression. True bypass switching with a 3PDT footswitch keeps your signal untouched when off, and the low 5mA current draw works with standard 9V supplies or batteries. The four knobs give direct access to sustain, level, input sensitivity, and attack time so you can dial in subtle peak reduction or heavier squash without reaching inside the pedal. An internal trimmer is still present for fine bias tweaks if needed. The top-mounted DC jack fits most pedalboard power supplies.

Specifications

• Dimensions: 2.35 in x 4.41 in x 2 in
• Power requirements: 9V DC, 5mA current draw
• Bypass type: true bypass, 3PDT switching
• Controls: sustain, level, input, attack
• Low-noise metal film components and hand-matched transistors

Condition

This item has been tested and is in good working condition. It does not come with original packaging. It has no Velcro on the back. No power supply included.