API Audio Accessories 527 Operators Manual

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API Audio Accessories 527 Manual Information:

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[Page 1] API Audio Accessories 527

API, 8301 Patuxent Range Road, Jessup, MD 20794 Tel: 301-776-7879 www.apiaudio.com 527 Compressor/Limiter Operator's Manual Revised 06-07-12 ...

[Page 2] API Audio Accessories 527

Features • Feed-forward or feed-back compression • Hard or soft knee compression •PatentedTHRUST®switchforfrequency dependent side chain control • Continuously variable detented THRESHOLD control • Continuously variable detented ATTACK and...

[Page 3] API Audio Accessories 527

The patented THRUST® function can be switched in and out via the front panel as well, applying a high pass filter before the RMS detector circuit that preserves that punchy bottom end. The 527 Compressor sections of two or more can be linked togethe...

[Page 4] API Audio Accessories 527

API 527 Compressor Compressor Controls The 527 Compressor provides a comprehensive suite of controls: · OUT: Output level adjust · THRESHOLD: The level at which compression begins · ATTACK: The time it takes for the compressor to respond · RELEA...

[Page 5] API Audio Accessories 527

API 527 Compressor OV 0 10 dB T U O 0 0 T H R E S H 10 -20 7 4 0 -3 dBu -6 .3 .5 1 2 2.5 3 1.5 RELEASE S 1 5 15 20 ATTACK mS 25 THRESHOLD THRESHOLD: Sets the level at which compression begins · Continuously variable between +10dBu and -20dBu · Det...

[Page 6] API Audio Accessories 527

API 527 Compressor 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 limiter · ...

[Page 7] API Audio Accessories 527

API 527 Compressor VU GR -3 -5 -7 OV 0 -10 -1 -20 1 2 3 -8 -6 -4 -1.5 -10 -12 -15 -17 -19 -23 METERING - Output Level An OUTput level meter is provided to indicate the 527’s output in VU when the METER switch is in the VU position. The audio outp...

[Page 8] API Audio Accessories 527

TYPE LINK KNEE THRUST R METER VU GR IN NEW OLD HARD SOFT IN IN LINK LINK: The LINK switch activates the DC control voltage summing with other units. API 527 Compressor Instead, when each of the 527s’ Link switches are pressed, they will contribu...

[Page 9] API Audio Accessories 527

API 527 Compressor COMPRESSION TYPE The 527 Compressor can be set to operate in two circuit topologies: · OLD: Feed-Back topology: The RMS detector receives the signal from after the VCA · NEW: Feed-Forward topology: The RMS detector receives the ...

[Page 10] API Audio Accessories 527

API 527 Compressor NEW: Feed-Forward Compression In a feed-forward compressor, the RMS detector normally gets its signal from a split of the input signal. With this method, the RMS detector sends a signal to the VCA that is an exact ratio of the de...

[Page 11] API Audio Accessories 527

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...

[Page 12] API Audio Accessories 527

API 527 Compressor THRUST R SOFT IN IN THRUST The 527 Compressor includes API’s patented THRUST®circuit that can be switched in or out as needed. This places the THRUST® filter before the RMS detector that decreases the compressor’s reaction t...

[Page 13] API Audio Accessories 527

API 527 Compressor TYPE LINK KNEE THRUST R METER VU GR IN NEW OLD HARD SOFT IN IN IN/OUT Switch IN: The In/OUT switch inserts or removes the 527 from the audio path via a relay bypass. When the switch is in the OUT position, a relay connects the aud...

[Page 14] API Audio Accessories 527

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...

[Page 15] API Audio Accessories 527

I n a c o n s t a n t e f f o r t t o i m p r o v e t h e s u b t l e d e t a i l s o f o u r p r o d u c t s , s o m e a m o u n t o f c h a n g e i s i n e v i t a b l e . A P I r e s e r v e s t h e r i g h ...