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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

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Содержание 527

Страница 1: ...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 ...

Страница 2: ...detented ATTACK and RELEASE controls Continuously variable detented OUTput level control Continuously variable detented RATIO control 10 segment gain reduction GR meter Side chain input LINK switch for multiple unit interdependent compression linking stereo compression COMP BYPASS switch with hard relay bypass when in the Out position Audio circuit uses the 2510 and 2520 discrete op amps API 527 C...

Страница 3: ...ic of API products 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 OLD gain reduction methods selectable on the front panel provide a choice of that old way or the new way of co...

Страница 4: ...he 527 Compressor from the audio path when not pressed 527 TYPE LINK KNEE THRUST R METER 3 5 1 2 2 5 3 1 5 RELEASE S VU GR 3 5 7 OV 0 10 1 20 1 2 3 V U G R I N N E W O L D H A R D S O F T I N 0 10 dB T U O 0 T H R E S H 10 20 7 4 0 3 dBu 1 5 15 20 ATTACK mS 25 IN RA TIO 1 1 5 3 2 5 6 10 0 4 0 0 8 6 4 1 5 10 12 15 17 19 23 6 OUT Continuously variable 31 position detented output level pot THRESHOLD ...

Страница 5: ... 25 ms milliseconds Detented 31 position rotary pot for easy recall RELEASE Sets the time it takes the compressor to recover to unity gain after the level falls below the set THRESHOLD Continuously variable between 3 and 3 seconds S Detented 31 position rotary pot for easy recall 1 5 15 20 ATTACK mS 25 3 5 1 2 2 5 3 1 5 RELEASE S Attack and Release times are fully variable on the 527 Compressor an...

Страница 6: ...7 19 23 TYPE LINK KNEE THRUST R METER V U G R I N N E W O L D H A R D S O F T I N IN RATIO METERING Gain Reduction A gain reduction GR meter is provided to indicate the amount of compression being applied when the METER switch is in the GR position When no gain reduction is being applied all LED s are lit on the Gain Reduction meter GR When compression occurs the corresponding LED s extinguish to ...

Страница 7: ...o indicate the 527 s output in VU when the METER switch is in the VU position The audio output increments provided are 3 dB 2 dB 1 dB 0 dB Note 0Vu 4dBu 1 dB 3 dB 5 dB 7 dB 10 dB 20 dB In addition a PEAK OV LED is provided that will illuminate at 27 dBu TYPE LINK KNEE THRUST R METER V U G R I N N E W O L D H A R D S O F T I N IN Page 6 ...

Страница 8: ... image or surround image during compression or affecting one audio signal with another s dynamic characteristics Front panel controls that affect the DC side chain signal and therefore the compression parameters of ALL linked units include the Threshold Attack Release Hard Soft New Old Thrust and Ratio controls Adjusting ANY of these controls will affect the signal that will be sent out and summed...

Страница 9: ...lected using the TYPE switch TYPE LINK KNEE THRUST R METER V U G R I N N E W O L D H A R D S O F T I N IN In a feed back compressor the RMS detector gets its signal from the output of the gain reduction device VCA This is how older API 525 1176 type and 660 type compressors work This yields a smoother softer more transparent sound OLD Feed Back Compression IN OUT THRESHOLD ATTACK RATIO RELEASE LIN...

Страница 10: ...pression and a harder more affected sound TYPE LINK KNEE THRUST R METER V U G R I N N E W O L D H A R D S O F T I N IN KNEE Knee determines the 527 Compressor s response curve at the onset of compression The 527 Compressor has two 2 knee settings that control how the compressor transitions into compression SOFT Rounded response curve HARD Sharp response curve The knee of the compressor is selected...

Страница 11: ...radual 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 Immediate onset of compression sudden transition to set ratio More aggressive and noticeable Page 10 ...

Страница 12: ...nergy to sound correct to your ear In Hi fi equipment a LOUDNESS contour is used to equalize the music at lower levels so it sounds correct Even with this curve there is still a substantial amount of low frequency information compared to high frequency information in the audio signal path When that signal is fed into the RMS detector the detector will process the signal into a DC control voltage b...

Страница 13: ...L D H A R D S O F T I N 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 audio Input to the Output completely removing the 527 from the audio chain Page 12 ...

Страница 14: ... 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 comp setting Signal to Noise Unweighted 100dB below clipping 26dBu 0 1 distortion no compression Power Requirements 15 18VDC 130mA Conforms to Automated Processes Inc VPR Allia...

Страница 15: ...l e A P I r e s e r v e s t h e r i g h t t o m o d i f y o r c h a n g e a n y o f t h e f e a t u r e s s p e c i f i c a t i o n s o r p e r f o r m a n c e o f i t s p r o d u c t s w i t h o u t n o t i c e o r o b l i g a t i o n 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 a p i a u d i o c o m F ER ...

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