API 527 500-Series Compressor (Used)


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Product Code: 2692-2
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Front End Audio acquires previously owned gear through our Buy-Back program. You can purchase used gear at a great price but there are no manufacturer warranties with these items. These items have been inspected and/or tested by our staff to make sure each one is in working condition and comes with our commitment to service. This API 527 looks great and functions perfectly. It doesn't include the original box but we will make sure it is packaged securely and arrives safely!

The API 527 500-Series Compressor offers fast response, and a natural and punchy sound, perfect for tracking and mixing. Link two of them for stereo/buss applications, and you have a great glue comp at you disposal. The API 527 500-Series Compressor takes it's place alongside the family of API VCA based compressors, the 225L and the 2500 Stereo Bus Compressor. Anyone familiar with those units will immediately be at home with the 527. Features common to the line like "feed forward" (NEW) and "feed back" (OLD) gain reduction methods selectable on the front panel, provide a choice of "that old way", or "the new way" of compression, for the highest level of flexibility in signal gain control. The "old way" or Feed-Back method is what most of the classic compressors used for the gain control circuit. The "new way" gain reduction is more typical of the newer VCA type compressors that rely on RMS detectors for the gain control voltage. There is a "SOFT"/"HARD" switch 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.

API 527 500-Series Compressor Features

  • Audio circuit uses the 2510 and 2520 Discrete Op Amps with transformer output
  • Continuously variable detented Threshold control
  • Continuously variable detented Attack and Release controls
  • Continuously variable detented Ratio control
  • Output Fader level control
  • 10 segment VU/Gain Reduction meter with selector switch
  • Overload LED
  • "Link" switch for multiple unit interdependent compression linking
  • "New"/"Old" switch for feed-forward or feed-back compression
  • "Hard"/"Soft" compression curve knee switch
  • Patented THRUST® switch for frequency dependent side chain control
  • "IN" switch with hard relay bypass when in the "Out" position

API 527 500-Series Compressor Specifications

  • Input Impedance: High Level In 160K ohms, Low Level In 80K ohms
  • Output Impedance: High Level Out 85 ohms, Low Level Out 50 ohms
  • Nominal Operating Level: -2dBu or +4dBu
  • Maximum Input Level: +26dBu
  • Maximum Output Level: +26dBu
  • Output Fader Control Gain:- Infinity to +10dB
  • Attack Times:1 millisecond to 25 milliseconds (typical)
  • Release Times: 0.3 seconds to 3 seconds (typical)
  • Compression Ratios: 1:1 to 1:Infinity
  • Threshold Control Range: +10dBu to -20dBu
  • Metering:
    • 10 RED LED VU scale: -20VU to +3VU (positive illumination indicator)
    • RED GR scale: -1.5dB to -23dB (negative illumination indicator)
    • RED Overload LED: +27dBu (clipping)
  • THRUST Filter Action: -10dB/Decade slope, unity @ 1kHz
  • Frequency Response: +/- 1dB 20Hz - 20kHz
  • Total Harmonic Distortion: < .2% THD, any level below clipping, any compression setting
  • Signal to Noise: Unweighted -100dB below clipping (+26dBu@0.1% distortion, no compression)
  • Power Requirements: +/- 15-18VDC @130mA

API 527 500-Series Compressor Includes

  • 527 500-Series Compressor

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