Question about Crest Audio CPX-900 Amplifier

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Crest Audio CPX-900 Amp


The right speaker (Community MVP15HO's) is not as loud and clear as the left speaker. Both left and right volume controls are at the same setting and both green light indicators are on. The sound quality is slightly off and not as loud as the normal speaker. I've tried switching cables, but it stays the same which tells me the cables are ok.



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Check the input signal.switch the cables and see if that changes anything.also check the back of the amp for filters.make sure that they are set the same way.check cables on source coming in to to rca's or rca's to xlr's.make sure amp is not set to parallel inputs or bridged mono.

Posted on Dec 19, 2008

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Crest audio cpx 1500 , one channel stop working ,why

Often you can track the source of the heat down to a specific semi-conductor. This is often down to touch. The thing that heats up the first and gets the hottest should be replaced.

Oct 03, 2014 | Audio Players & Recorders

1 Answer

Crest audio cpx 1500 , one channel stop working ,

The breaker is stuck because there's some internal circuit problem on the amp. Something is tripping it i.e. a wiring short or blown speaker driver if they're connected, or an output transistor has blown.

Fix the problem BEFORE trying to reset.

Switch all off. Disconnect your speakers from the power amp. Switch the amp back on. If it will reset now then you have a wiring or speaker issue. If it won't reset then the problem is something broke in the amp.

Transistors are part of the circuit board. They're soldered in and also bolted to heat sinks. Not a DIY fix unless you know what you're doing. Take the amp to a repair shop.

Sep 04, 2014 | Audio Players & Recorders

1 Answer

I have a Crest Audio V900, a set of Bose 901, a Gemini EQ-3000. Do I need a PREAMP? Or can I hook up the Crest AMP to the Equalizer?

You could use the EQ but it won;t sound as good as it will with a pre amp and also could make it a bit trickier when adjusting the volume and getting it to sound right.

Mar 10, 2012 | Crest Audio Audio Players & Recorders

1 Answer

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.

Feb 10, 2011 | Crest Audio CA4 Amplifier Amplifier

1 Answer

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.


Feb 09, 2011 | Crest Audio CA 9 2Channel Amplifier

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I have a crest 901 and the banana plgs will not insert into the amp. I bought it from a guy on ebay and paid for shipping and insurance. i am afraid that aaaaI got messed over. the amp was not insured, but...

Find a local music store that sells power amps and see if they know a tech who can look at it. If the banana jacks are whacked , theyre easy to replace

Nov 30, 2010 | Crest Audio CPX-900 Amplifier

1 Answer

Can cpx 900 be bridge @4 ohm?

The short answer is no. This amp was designed to be bridged with an 8Ohm load not 4. That being said, the unit will work, but get very hot and possibly get damaged should you provide it too low an impedence load. DO NOT conenct this ti a 4Ohm load in bridge mode.


Oct 27, 2010 | Crest Audio CPX-900 Amplifier

2 Answers

Every time I turn the amp on it shuts its self off.

disconnect all speakers and test if the problem corrected you will have a problem in your speakers(either wire or speaker itself)-try to connect the speakers one by one until you find the bad one and change it--if all above does not work send your amp to service center near you

Mar 30, 2009 | Crest Audio CPX-900 Amplifier

1 Answer

What Crest Amplifier series replaces the VS series

This is kind of an ambiuous question. Are you looking for barrier strip inputs and outputs? Are you looking for 70V output lines? Or are you looking for a standard 1/4" TRS input with either 1/4" or speakon outputs? If you can describe your application requirements, I can provide you with a recommendation.


Mar 09, 2009 | Crest Audio CPX-900 Amplifier

1 Answer

No power

These amps are very compact and are not the easiest to work on. If you are not experienced at repair, I would not recommend you start here. Where are you located?


Jan 13, 2009 | Crest Audio CPX-900 Amplifier

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