5 2 9 S t e r e o C o m p r e s s o r
A P I
2
Introduction
The new 529 Stereo Compressor combines the
unmistakable sound of API’s compression technology
with the convenience and popularity of the API 500
Series format.
Carefully designed to deliver a wide range of
compression options, the 529 delivers warmth, clarity
and punch, whether used for subtle adjustments or
heavy compression effects.
Based on the unprecedented success of the 2500, the
529 takes many of the features and controls from
API's famous stereo bus compressor and puts them
into the first dual slot 500 series module from API.
Using API's discrete op-amps and transformer
technology, the 529 delivers the legendary analog
sound of API.
The 529 is a two-channel, stereo-linked dynamic
processor designed for stereo program bus
compression and compression of any stereo audio
source. The audio input signals from both channels
are combined in a true-RMS power summing fashion
to create the compression control signal for the
detection path. Then, the resulting compression
signal is applied evenly to both channels for proper
balance. All front panel settings control both channels
simultaneously.
This stereo compressor features API's patented
THRUST
®
circuitry for a punchy low end, along with
an OLD/NEW switch that lets you choose between
classic and modern compression characteristics: OLD
for vintage-style feedback compression and NEW for
today's more common feed-forward compression. The
3-position KNEE switch adjusts the shape of the curve at the onset of compression 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 Auto MAKE UP gain function lets you adjust ratio and threshold controls without affecting the
output level. Alternately MAKE UP gain can be set manually.
Features
Continuously variable 31-position detented controls for Gain, Threshold, Ratio, Attack & Release
Stereo 10-segment LED VU meters show selectable Input or Output levels
10-segment LED Gain Reduction meter
“Over Threshold” LED illuminates when input audio cross the set THRESHold
Patented
THRUST
®
filter for frequency dependent side chain control
3 selectable compressor curve KNEE settings
Selectable NEW or OLD switch for feed-forward or feed-back operation
Selectable automatic or manually variable compressor make-up gain
Full hard-wired relay bypass
Audio circuit uses 2510 and 2520 discrete op amps with transformer output
2-space 500 Series installation
