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Author Topic: CP650 public address
Anhtu Vu
Film Handler

Posts: 76
From: Montreal, Quebec, Canada
Registered: Jun 2013

 - posted 08-15-2013 06:34 PM      Profile for Anhtu Vu   Email Anhtu Vu   Send New Private Message       Edit/Delete Post 
I just installed a CP650/DMA8+ with a new QSC speaker's system in our cinema room. Everything works and sounds pretty good so far and i have not even calibrated the QSC yet.

Does anyone knows if the public address on the CP650 has automatic limiter preset in the chain. It seems like it has very little headroom.

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Jim Cassedy
Phenomenal Film Handler

Posts: 1569
From: San Francisco, CA
Registered: Dec 2006

 - posted 08-15-2013 09:40 PM      Profile for Jim Cassedy   Email Jim Cassedy   Send New Private Message       Edit/Delete Post 
I don't think the CP-650 has any type of processing on the microphone input.
I've always used an external limiter & feedback filter.

Is it possible you're over-driving the input?

I know you can set the non-sync input levels on the set-up menu, but I don't
recall there being any way to adjust the microphone input level. (but I could be wrong)

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Louis Bornwasser
Film God

Posts: 4435
From: prospect ky usa
Registered: Mar 2005

 - posted 08-15-2013 09:54 PM      Profile for Louis Bornwasser   Author's Homepage   Email Louis Bornwasser   Send New Private Message       Edit/Delete Post 
Might also have the phantom power on.

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Carsten Kurz
Film God

Posts: 3882
From: Cologne, NRW, Germany
Registered: Aug 2009

 - posted 08-16-2013 02:47 AM      Profile for Carsten Kurz   Email Carsten Kurz   Send New Private Message       Edit/Delete Post 
quote: Anhtu Vu
Does anyone knows if the public address on the CP650 has automatic limiter preset in the chain. It seems like it has very little headroom.
What did you connect to it and how?

- Carsten

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Steve Guttag
We forgot the crackers Gromit!!!

Posts: 12315
From: Annapolis, MD
Registered: Dec 1999

 - posted 08-16-2013 12:05 PM      Profile for Steve Guttag   Email Steve Guttag   Send New Private Message       Edit/Delete Post 
I believe you'll find that the MIC input on the CP650 is one of the few places left where one needs a tweaky tool (flip down the front panel). Other than level, there is no processing in the CP650.

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Tony Bandiera Jr
Film God

Posts: 3019
From: Moreland Idaho
Registered: Apr 2004

 - posted 08-16-2013 12:12 PM      Profile for Tony Bandiera Jr   Email Tony Bandiera Jr   Send New Private Message       Edit/Delete Post 
Carsten asked a critical question: What is connected to it and how?

You MUST connect a microphone with balanced inputs (XLR) or a mic with a matching transformer.

DO NOT connect any mixers, preamps or other signal processing to that input.

Also, you cannot use the rear panel XLR and the front panel DB9 "Mic Mux" connectors at the same time.

Finally, if the sound is "tinny", lacking bass and dynamic range, you may have a bad mic cable with one line open.

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