API 525 Single-channel Modular Compressor

A Reissue of a 1970s Classic!
With the API 525, you get to snag the sound of API's famous 525 — a modular compressor originally introduced in the 1970s. This compressor reissue is a "feedback" type of compressor, for classic sonic character and exceptional dynamics control behavior. Onboard the API 525, the cool multi-function "ceiling" control can lower threshold while raising output level to match, so you can adjust dynamics without changing level. As part of API's modular 500 Series, you'll enjoy classic-but-versatile character in a flexible and reasonably priced design, with the API 525.
API 525 500 Series Modular Compressor at a Glance:

Reissue of a 1970s classic
API's 500 Series: Long-term flexibility, lasting value

Reissue of a 1970s classicIt could be argued that the API 525 is 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 the API 525's gain reduction (lower threshold) while simultaneously raising output level to match, so you can alter dynamics "on the fly" without level changes. Here, this API 525 is an exacting reissue — its design, in fact, as been taken from the original blue prints and spec control drawings, dusted off from the API archives. You get all of that famous sonic character the API 525 was known for in the 1970s — in a new and still-flexible design.
API's 500 Series: Long-term flexibility, lasting valueThe beauty of the entire API 500 Series is its long-term flexibility and lasting value — especially when you consider that needs change over time. With a range of mounting frame options, the API 525 will be a valuable asset to your ever-changing studio rigs. It's also ruggedly designed with sound you just won't outgrow — crafted to be your sonic partner for year after year after year.
API 525 500 Series Modular Compressor Features:

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
VU meter for monitoring gain reduction
4 Switchable release modes
De-ess function
Traditional API fully discrete circuit design
Hardwire bypass

API 525 500 Series Modular Compressor Specifications:

Input Impedance: > 30 K Ohms, Balanced
Output Impedance: 100 Ohms, Transformer coupled, Balanced
Operating Levels: -15dBu to +20dBu
Maximum Gain Reduction: 25dB
Noise: 98 dB below +10dBu output, at 10dB of Compression
Harmonic Distortion: 0.5% Max, 30Hz to 20kHz
Attack Time: 15 micro seconds
Release Times: .1, .5, 2.0, 2.5 seconds
De-essing: Inversion of the Voice Energy Curve
Slopes: Compression, 2:1, Limit, 20:1
Metering: Compression or Limiting-Illuminated Analog dB meter, shows Gain Reduction
Frequency Response: +/- .5 dB, 30 to 20 kHz
Power Requirements: +/- 12/18 Volts/DC, at 80 ma.

The API 525 is an exacting reissue of API's 1970s-classic solid-state compressor!


Tech Specs



Number of Channels
1


Controls
Input, Output, Mode, Ceiling, Release


Ratio
2:1 or 20:1


Frequency Response
30Hz-20kHz


Height
5.25"


Depth
7.5"


Width
1.5"


Weight
1.77 lbs.


Manufacturer Part Number
525






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