![]() The higher the voltage, the more light is shone on the photoresistors. The photoresistors’ impedance increases as the light-panel glows brighter, thereby reducing gain and levelling out (compressing) the sound. ![]() ![]() This is how the opto-compressor works: driven by the unit’s side chain, the panel becomes brighter as transient peaks increase in volume. This unit’s T4B module makes use of two carefully matched Silonex NSL5910 photoresistors and a long-life electroluminescent panel for its gain control. It’s an optical-compressor design based around GAP’s version of the original T4 electro-optical gain-reduction module, used in the original Teletronix LA-2A. The Comp-2A is a 2U, half-rack, single-channel compressor/limiter with transformer-balanced input and output. Both units’ origins can be traced back to Teletronix’s LA-2A, the legendary optical compressor launched way back in 1962 – the year The Beatles released their first single. Last year, I reviewed Golden Age Project’s Comp-3A, the solid-state version of the valve (or tube, if you prefer) unit on test here. ![]() HF control for mid/high frequency compression.Price £560 Contact Golden Age Project | Runway Pro Audio | 07591 153 006 COMP-2A key features:
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