Klark Teknik DN504 Quad Compressor with XLR in/out and a jack socket for sidechain control.

1U Rack mounting

IEC - 13A mains lead included

All LEDS working

No noisy pots

Probably one of the best sounding compressors ever designed and built.

Four channels of compression or can switch to two stereo channels.

Each channel has control for Threshold, Ratio, Attack, Release & Gain.