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API 525

The API 525, originally released in the 70's, the API 525 is a "feedback" type compressor. It fits your API Lunchbox as well as any other 500 series rack.

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.
  • 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
  • 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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    Free shipping in Canada. Conditions
      Price/Day Total
    1 Day $30.00 $30.00
    3 Days $20.00 $60.00
    5 Days $15.00 $75.00
    12 Days $10.00 $120.00
    28 Days $6.50 $182.00
    Additional information
    For more information about the 525, please visit the website of API
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