So ive never had a problem with my preamp til about a month ago when you turn it on everything will be fine and than out of nowhere youll hear a crackle through the speakers and the lights that indicate what speakers are playing will go out sometimes it will come back on sometimes it wont. if you turn it off for a few minutes it will come back on like normal and repeat the process. has this ever happened to anyone else and what is the problem?
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well..this is one for the books. Can you tell me what the ratings are between the 252 and the 752 impedance matching wise? even though it might work sometimes, impedance matching can wreak havoc between mismatched amps.
Then you have found your problem. It's internal on the amp. Protection circuitry issue. Have it Benched at a shop with the same impedance you are running it at. If it benches ok, check your ground, it should be no longer than 18" and go directly to the floor frame, not a seat bolt. You should also be running at least 4ga power as well. Hope this helps.
I'm not quite sure of how the two amps are interacting here, so I'd like to request that you describe the entire hookup. Sending a higher signal from the mixer should not be a problem, but something is wrong in the setup (I think).
Please update this with a description of how you have the mixer and amps connected to the speakers.
if it is not working then there is another serious problem , and it could be the amp IC or the volume IC but tests will need to be done to determine what is causing the failure , but it does sound like amp IC as a suspect since the rear were not even working , did the volume seem different when turning it up or down before the center quit or after the center quit?
The potentiometer (volume control) is probably dirty. Open the amp and find the "pot" connected to that volume control. You should be able to see small opennings where you can spray electrical contact cleaner inside. Give the knob a few turns and try it out. If it gets better but not perfect, repeat. If several attempts don't eleminate the problem, the pot will most likely need to be replaced. Contact cleaner can be found at any electrical supply store such as Radio Shack. Be sure to use one that says no or zero residue. I use a product called Electrosolve.