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Author
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Topic: CP45 with low output levels
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Luciano Brigite
Master Film Handler
![](http://www.film-tech.com/ubbmembers/1104b.jpg)
Posts: 277
From: Sao Paulo, SP, Brazil
Registered: Jan 2002
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posted 05-21-2009 09:47 AM
Hello ,
I'm having some hard time with a CP45 putting low levels in the auditorium.. About 2 years ago I serviced this same theatre and re-did then entire A/B chain alignment and the processor had a bit of level left ( The output trims were at that time left between 1/2 to 3/4 of their setting) and sound in the auditorium was vivid and clean. Then I got called to service it recently and found everything messed up, from sound reader to amplifiers and even the speakers! While redoing the reader alignment, I found out that the projector input being used had one of the channels with a very low level (turning up all the way the gain for htat channel would make any of the leds in the NR card to light, even the red led on the low level side) the cable was changed to the ohter input and things were ok, levels could be set properly and A-chain finished as it should. Things got ugly when came the time to do B-chain, all the output trims are at the maximum and the channels are hardly putting out the 85dB. I Checked the power amps and are ok. two fo the screen speakers had blown HF drivers and those were replaced. EQ could be done but sound isn't good.While the response is ok ,even at the low level, while the film is running, sound is muffled at the screen channels and surrounds are nearly dead ( even if the signal leds in the processor indicates a signal there). The way I mention the problem will lead many to think that the reader has a problem, however it's properly set and working ( lateral,azimuth and response are all ok).
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