Question about Kenwood KAC-9102D Car Audio Amplifier

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Amp overheating could the the problem be in the ground wire. the reason i say this is because about a minute or two later the amp comes back on.

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Re: amp overheating

No, a ground would not make it overheat. Your overdriving the amp, so it goes into thermal shutdown, and when it cools off, it comes back on. You don't have enough ventilation for this amp or theres a idle bias circuit problem. If its a ventilation issue. you could add a small 12 volt muffin fan to the amp. If it's the idle current problem, its going to blow up the outputs device's soon, unless you have this checked out in the shop, under a set of load resistors and a scope.

Posted on Sep 02, 2006

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One of my friends had a amp like that , i looked at it an the inside of speaker box wires was touching , if thats not it then check ur power an ground , power wire must be the same size ground an if ur ground is not grounded good then u will get the cuting out .

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Hot Amp!!!

I'm having trouble visualizing exactly how you have it set up. You said that the amps are "grounded through the amp" but I think you meant they're grounded through the cap. I don't think that's the cause of your problem, but the cap and amplifiers really should be grounded separately. There's no reason to run the grounds to the cap instead of directly to the chassis. It seems more likely to me that the problem is related to your speaker wiring. I'm not clear on how your speakers are wired either; I can see that you've kept the speakers on factory wiring, and connected the amp to the factory wires. But I don't understand how that translates to having only one set of wires for both speaker sets. We'll leave the tweeters out of it; if they're wired through a crossover, then they don't have a serious effect on the impedance. However, any way you look at it, you've got two 4-ohm speakers wired together to a bridged amplifier. Most 2-channel amps aren't designed to be connected to load impedance under 4 ohms when they're in bridged mode. If your speakers are wired in parallel, then the load impedance at the amp is 2 ohms. Having too low a load impedance is the most common cause of amplifier overheating. My advice is to re-wire the speakers so that one 5x7 and one tweeter (together with a crossover) is connected to each amplifier channel. Don't run the amp in bridged mode. Even in this configuration, I'd be amazed if your 5x7" speakers are really rated to handle 310 watts RMS, which is the per-channel power rating of your amp in 2-channel, 4-ohm mode. It sounds to me like you've got too big of an amp for the job.

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Sounds to me like the amp is going into protection mode. Try placing one sub on the amp with very little gain. One of the biggest reason why this happens is because the subwoofers are wired wrong. What is the brand and model number for your amp?

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hi check the ground wire , make sure the ground has a good connection. next, make sure there no wires touching. might wanna check the fuse on the amp,make sure te hass good air flow thanks

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It sound like you have a fault on one of the speakers, try disconnecting the speakers and see if still overheats.

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What u think

Hello jayPRICAN,

You do not say what kind of speakers you are running on the amp and that can affect how you troubleshoot the problem.

Most often, a wiring problem such as a faulty ground or short in the speaker wires will cause such a problem. Here are the most likely causes for the amp to go into protection.

1) When a speaker wire is shorted or grounded.
2) Overheated.
3) When a ground wire of the receiver/head unit or the amp itself is not properly grounded.
4) When the amp itself malfunctions and a DC is sent to the speaker output.

First check your power, ground and remote turn-on wires. Then disconnect the inputs and speaker wires. If the amp does not power up normally with all the other wires disconnected, the amp itself is defective. If it does power up with everything else disconnected, reconnect the wires one at a time to determine where the problem is located.

Hope this helps.

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