Related Manuals for API 527
Summary of Contents for API 527
- Page 1 527 Compressor/Limiter Operator's Manual API, 8301 Patuxent Range Road, Jessup, MD 20794 Tel: 301-776-7879 www.apiaudio.com Revised 06-07-12...
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Page 2: Threshold Control
API 527 Compressor Features • Feed-forward or feed-back compression • Hard or soft knee compression • Patented THRUST® switch for frequency dependent side chain control • Continuously variable detented THRESHOLD control • Continuously variable detented ATTACK and RELEASE controls • Continuously variable detented OUTput level control •... - Page 3 API 527 Compressor The API 527 Compressor takes its 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"...
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Page 4: Compressor Controls
KNEE - Selects Hard or Soft knee RA TIO THRUST - Inserts the Thrust Filter in the RMS detector IN - Inserts the 527 into the audio path The 527 Compressor provides a comprehensive suite of controls: · OUT: Output level adjust ·... -
Page 5: Attack And Release
· Detented 31 position rotary pot for easy recall · Turning clockwise results in more Compression ATTACK and RELEASE Attack and Release times are fully variable on the 527 Compressor and share a dual-concentric potentiometer for control. Attack time is adjusted using the outer ring of the pot and Release time is adjusted using the inner knob. - Page 6 API 527 Compressor RATIO RATIO: Sets the ratio of input vs. output levels for signals that exceed the set THRESHOLD · Continuously variable between 1:1 and infinity (hard Limiting) · A Ratio of 10:1 or greater is generally considered to be a...
- Page 7 API 527 Compressor METERING - Output Level An OUTput level meter is provided to indicate the 527’s -1.5 output in VU when the METER switch is in the VU position. The audio output increments provided are: · +3 dB · +2 dB ·...
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Page 8: Important Note
DC summing bus on the 500 series module motherboard. This allows for any number of 527 compressors to “LINK” their side chain signals into a common control bus for tasks such as maintaining stereo image or surround image during compression, or affecting one audio signal with another’s dynamic... -
Page 9: Compression Type
API 527 Compressor COMPRESSION TYPE The 527 Compressor can be set to operate in two circuit topologies: METER · OLD: Feed-Back topology: detector receives the signal from after the VCA LINK · NEW: Feed-Forward topology: The RMS detector N E W... - Page 10 KNEE Knee determines the 527 Compressor’s response curve at the METER onset of compression. LINK The 527 Compressor has two (2) knee settings that control how the compressor transitions into compression: N E W TYPE SOFT: Rounded response curve O L D...
- Page 11 API 527 Compressor KNEE Soft Knee Compression SOFT: Rounded response curve · Gradual onset of compression (fade-in up to the set ratio) · Similar to an “over-easy” type knee · Generally considered more transparent Hard Knee Compression HARD: Sharp response curve ·...
- Page 12 API 527 Compressor ® THRUST S O F T The 527 Compressor includes API’s patented THRUST® circuit THRUST that can be switched in or out as needed. This places the THRUST® filter before the RMS detector that decreases the compressor’s reaction to low frequency content. The result is a noticeable increase of punch and low frequencies, but a uniformly compressed signal.
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Page 13: In/Out Switch
API 527 Compressor IN/OUT Switch IN: The In/OUT switch inserts or removes the 527 METER from the audio path via a relay bypass. When the switch is in the OUT position, a relay connects the LINK audio Input to the Output – completely removing the N E W 527 from the audio chain. -
Page 14: Specifications
API 527 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:... - Page 15 = F E A P I , 8 3 0 1 P a t u x e n t R a n g e R o a d , J e s s u p , M D 2 0 7 9 4 T e l : 3 0 1 - 7 7 6 - 7 8 7 9 w w w .
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