Transformer balanced input and output

Classic T4-style electro-optical attenuator for gain control with program-dependent attack and release time

Gain and peak reduction controls

VU meter for displaying gain reduction and output volume

Hard-wire bypass

XLR line input and 6.3 mm jack

XLR line output and 6.3 mm jack

Link input for stereo operation with a second Comp-3A

External power supply

Design: 9.5" / 2U