Question about Crest Audio CA9 Car Audio Amplifier

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My CA9 has protect recurrent problems.

My 3 Crest Audio CA9 bought in 1997 have had protect problems : after some minutes of perfect work, the protect stopped one channel. It happened in 2001, just after the end of the warranty.
Crest Audio has issued a retrofit kit to replace SMD input board by a standart-components one, it costed me several hundred of euros each to fix this problem.
Now the problem reappears. In the service manual the solution is "change preamp board". AGAIN ???
These amplifiers are not reliable at all !
So my question is : has somebody the service manual for this CA9 upgrade ? Or can you help me to solve the problem ?

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  • loffet Feb 10, 2009

    thanks mlufkin84
    The problem is that I've NEVER use my amplifiers in bridged mode. The problem is on the preamp board - all clues I've found match the service manual, but this service manual is for the original CA9 and not for this upgraded model.

  • loffet Feb 11, 2009

    Well, I've found the schematics on the crest audio website :

    after some hours, my CA9 is OK ! :-)



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If you are bridged in parallel instead of in series the amp wont support the load so it turns the power protect on till the amp cant handle nomore then the amp will go if you have two subs bridged run them left speaker possative to to the amp possative for bridged mode then laft speaker negative to the right speaker possative then right speaker negative to your amp negative for bridged mode if you have them left and right speaker possative to amp possative and left and right speaker neggative to your negative to your amp thats parallel the ampwont support the 2 ohm load

Posted on Feb 09, 2009


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The signal light is triggered by the presence of an audio signal on the input side and should be visible. With the clip light on without any input signal, suggests a problem in the front end. This is not an amp to be worked on without a schematic. Try getting the prints for this from Crest (Peavey owns them now).


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Hello\r\ni was wondering if i could get some assistance :) my crest audio amplifier ca4 keeps shutting off. Do you have any idea what the problem is and if it can be fixed. thank you very much


Generally speaking, an amp protects itself from heat, shorts and overloads by refusing to turn on or stay on.

Overloads can be from excessive periods of high output and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced hands-on tech.

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I have a Crest Audio CA9 power amp. Channel A is stuck at full volume throughout the full scale. Can you advise what the problem is and how to fix it.

This may sound silly, but please check the setup of the amp. You can have the unit in "bridge" mode and have the speakers connected to both channels like it was in stereo mode and it will appear to work. This is not a good setup, but it can happen. In this case, only 1 of the controls will alter the volume.

Other than that, the volume control itself can be defective or the control circuit may be faulty. Without checking components inside, I can't say for sure.

Please note that these units have high voltages inside when powered on and can be dangerous. This is a pro unit and it not really a DIY repair unit. I would suggest that you seek professional assistance for this unit. I havce had a few of these for 15 years problem free with much use. Getting it repaired correctly will cost upto $200 (or more) but it worth it. This is a $1500 unit.

Please keep us posted on your progress.


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How to turn off the clip light is on red it does not turn off?

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