Originally released in the 70's, the API 525 is a "feedback" type compressor,
such as the 1176 and 660, etc. An input (threshold) control and output (make-up
gain) control are provided. An additional "Ceiling" fine tune function modifies
threshold and make-up gain for precise changes in compression without
changes in output. 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/p-pop
reduction. The 525 is an identical re-issue of one of the most popular API
The API 525 is perhaps the most successful solid state feedback compressor in
history. It delivers dynamics control behavior unlike VCA "feed forward"
compressors so common today. A remarkable multi-function "ceiling" control can
increase gain reduction (lower threshold) while simultaneously raising output
level to match, so the user can alter dynamics "on the fly" without level
changes. This re-issue 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 just low frequency 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 benefits of the
API 525 are most obvious to those who use compression on a regular basis.
"Vintage" dynamics control, an easy to use multi-function control set, and a
wide range of 500 Series mounting options assure that the 525 will surpass your
most critical applications. With the addition of a hard-wire bypass switch, a
balanced input, and a pinout that is the same as all the other 500 series
modules, the 525 is still, after 25 years—"the sound". Two or more 525s can be
linked for multi-channel compression.
The 525 Feedback Compressor/Limiter makes use of the 2510 and 2520 op-amps
and therefore exhibits the reliability, long life, and uniformity which are
characteristic of API products.
0API 525 - Discrete Compressor, Re-Issue
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