API Audio 525 500-Series Compressor  From API

Single space compressor for the 500 series rack units.

API Audio

$1,230.25

Retail:  $1,295.00

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Manufacturer's Description from API

525

Discrete Compressor, Re-Issue

Features

  • 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

Originally released in the 70's, the API 525 is a "feedback" type compressor. An input (threshold) control and output (make-up gain) control are provided, along with an additional "Ceiling" fine-tune function which 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. 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.

The API 525 Compressor makes use of the 2510 and 2520 op-amps and exhibits the reliability, long life, and uniformity which are characteristic of all API products.

API Audio

About Manufacturer

API (Automated Processes, Inc.) is world famous for its all-discrete audio products: studio and broadcast mixing consoles, and a full line of rack mount mic preamps, equalizers and processors. It all began with a dream. It was 1968. The company: Automated Processes Inc., formed by men with a vision. Best known for their now legendary "2520 amplifier", this unique amp has been and will continue to be the heart of all API discrete products. It continues to provide reliability and sonic purity unmatched by the competition. The resulting console met the needs of the music, commercial and broadcast industry. API became the leading audio broadcast console manufacturer for radio and television networks and high profile stations. In addition, recording studios, large and small, began using API.....and receiving rave reviews from engineers and producers. There are over 700 API consoles across the nation and around the world, including the three major networks. Over thirty years later, many of these consoles are still in daily use in some of the most prestigious recording and broadcast facilities in the world because, to date, there are few, if any consoles of equal sound quality at a cost-effective price.

Specifications

Specifications

Input Impedance:

> 30 K Ohms, Balanced

Output Impedance:

100 Ohms, Transformer coupled, Balanced

Operating Levels:

-15 dBu to +20 dBu

Maximum Gain Reduction:

25 dB

Noise:

98 dB below +10 dBu output, at 10 dB of Compression

Harmonic Distortion:

0.5% Max, 30 to 20 kHz

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, @80 ma.

Size:

1.5" X 5.25" X 7.5" Deep

Size (Boxed for Shipping):

4.5" X 6.5" X 10"

Actual Weight:

1.77 lbs.

Shipping Weight:

2.17 lbs.

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