API 527A - Compressor / Limiter - 500-Series Module The API 527A is mono VCA based compressor limiter designed in the 500 series format. The 527A features selectable feedforward and fee-back gain reduction methods allowing users to have the highest level of flexibility in signal gain control. There is a "SOFT"/"HARD" knee switch for an "over-easy" type compression resulting in a very natural, uncompressed sound or a typical sharp knee type that lends itself to a much more severe limiting effect. The patented THRUST® function can be switched in and out via the front panel as well, applying a filter before the RMS detector circuit that preserves that punchy bottom end. Two or more 527A Compressor/Limiters can be linked together via a DC link allowing multiple units to be combined for stereo and multichannel applications. The output level remains fairly constant regardless of the threshold or ratio control, much like the "more/less" Ceiling control on the API 525 Compressor. This allows for live adjustments without any noticeable gain changes in the program level. The 527A Compressor/Limiter makes use of the 2510 and 2520 discrete op-amps and exhibits the reliability, long life, and signature sound which are characteristic of API products. Features Feed-forward or feed-back compression Hard or soft knee compression Patented THRUST® switch for frequency-dependent sidechain control Continuously variable, 31 position detented THRESHOLD control Continuously variable, 31 position detented RATIO control Continuously variable, 31 position detented ATTACK and RELEASE controls Continuously variable, 31 position detented OUT (output) level control 10-segment gain reduction/VU meter (GR/Output) Overload LED IN switch with soft and hard relay bypass Audio circuit uses the 2510 and 2520 discrete op-amps
