API-525
The API 525 Discrete Compressor was originally released in the 70's. Known as a "feedback" type compressor, the 525 makes use of the 2510 and 2520 op-amps and exhibits the reliability, long life, and uniformity which are characteristic of all API products.
Requires a 500 series rack unit to operate
Type: 500 Series
A compression/limit switch sets ratio at either 2:1 or 20:1. Attack time is as fast as 15u/s. Four auto release modes are offered via two switches, 0.1s, 0.5s, 1.5s, & 2.0s. A De-Ess function inserts an inverse vocal energy curve filter in the detector for effective sibilance/pop reduction. The 525 design has been taken from the original blue prints and spec control drawings from the API archives.
Release times vary with frequency, with high frequency / full bandwidth content released faster than lower frequencies for natural envelope tracking. Attack time is fixed, chosen to catch the fastest peaks, without "pumping". Equally useful as a tracking, mixdown or program compressor/limiter, the 525 utilizes "vintage" dynamics control and an easy to use multi-function control set. The 525 has a hard-wire bypass switch, a balanced input, and a pinout that is the same as all the other 500 series modules. Two or more 525s can be linked for multi-channel compression.
Exact reissue of API's original 525 from the early 70's
Peak detecting "feedback" compressor/limiter
Variable Threshold and Output levels
Unique "Ceiling" control combines key functions
Analog VU meter for monitoring gain reduction
4 Switchable release modes
De-Ess function
Traditional API fully discrete circuit design
Active Balanced Input/Output
Hardwire bypass