1 channel Solid state Electro optical Compressor with Program dependent Attack and Release Times, XLR and TRS I/O and External Power Supply Vintage-style circuitry with no integrated circuits Transformer-balanced I/O Capable of driving most balanced or unbalanced loads Internal jumper for selectable output-transformer loading - Lets you vary high-frequency response Employs classic T4-style electro-optical attenuator for gain control Program-dependent attack and release times Easy 2-control operation: Gain, Peak Reduction HF control increases sidechain circuit sensitivity to mid- and high-frequency content Large meter selectable between gain reduction and output level at 2 reference levels Hardwired bypass switch for 1-touch in/out comparison XLR and TRS I/O for flexible connectivity Link switch and jack for stereo operation with another Comp-3A External power supply (no interaction with audio circuitry) Classic sound, ideal for most sources and music styles Rugged build quality will provide many years of service Compact, 2RU half-rackspace chassis