Question about Kenwood KAC-8104D Car Audio Amplifier

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Amp turns off after about 5-10 minutes of use for a few seconds

My amp is brand new i hooked it up right and it makes my speakers pound. But the amp shuts off after only a mere 10 minutes of use for a few seconds then turns back on and works for a few more minutes then turns off again.

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One of two things...Amp is going into overload protection (should be indicated by a light on the amp), or you have insufficient power going to the amp....if this is the problem, try a 2 farad capacitor on the input power line to the amp.

Posted on Mar 12, 2009

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Why does my amp keep cutting off after a few minutes


Either amp overheating

Speakers wire are dropping below 2 ohms

Too small of wire feeding amp


Make sure amp has plenty of open space

Make sure wire feeding amp is sufficient for the wattage

Are you running the amp bridged or do you have multiple speakers hooked.

If you got anymore information I can answer a little better.

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The problem with my marshall ma100h amp is that out of the box brand new it stopped working within a few days. Earlier I turned on the amp power switch and let it warm up. About a minute later I kicked on...


Brand new? Take it for warranty repair IMMEDIATELY... don't mess with it !!!

The only thing for you to check is that you did not turn on "STANDBY" as this shuts down the power amp and the capacitors will bleed off and sound will fade. Try switch in both states before complaining

ONLY use the amp in STANDBY for a brief period (20 seconds) to let the tubes warm up... Leaving in STANDBY for a long period straains the input filter capacitor. If you are done with using the amp, turn it off...

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i actually have 2 12" type s's and i did the same thing just wanted a cheap amp... i went on ebay and bought a pyramid 1600 super blue series amp..... its 1600 watts and ive also hooked it up to type r's and it POUNDS!!! ill copy and paste the website where i got mine from on ebay... if you tune it right it'll make it so you cant breathe inside your car......http://cgi.ebay.com/NEW-1600-WATT-PYRAMID-PB559X-Car-Audio-Amp-Amplifier_W0QQitemZ350169009069QQcmdZViewItemQQptZCar_Amplifiers?hash=item5187b30bad

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2 car subwoofers, one doesnt play


Short in amp ? try swiching wire's to speaker's around . if other speaker then work's , speaker's are both fine . if not , then short in amp , or blown channel in amp . get new one or find someone who know's more than i do about amp's

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it sounds like you have the high lvl inputs on the amp hooked up instead of the rca's. this will cause the boominess for a few seconds when the amp is on and right when you turn it off

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If you know how to use a multimeter, you can test the amp this way:

-unhook the subs
-hook up a cheapie speaker you know for sure works to one of the channels
-unhook the audio inputs
-turn the amp on
-set your meter to VDC
-put the positive probe on the inside of the input connector, being sure you make contact with th inner contact
-take the negative probe and tap it on the outside of the connector

What you are doing is sending a low voltage (replicating an audio signal) into the amp audio circuit and allowing the amp to amplify it. If the amp makes the speaker pop each time you strike the probe, the amp is working.

There is an inherent problem with band passes. The naturally filter out high frequencies like a crossover, including distortion, so it makes it hard to hear when the subs begin to protest.

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If they have bridged the outputs of the amp, be sure that the "ohms" load is 8 ohms. This would then apply a 4 ohm load to each of the output channels. It sounds like they have bridged the output or else hooked up the speakers in a paralled configuration that is trying to kill your amp. If you are using dual voice coil speakers then you have to treat each of the voice coils as a seperate 4 ohm speaker and wire accordingly. You need to correct this NOW or else you will fry your amp. Good luck.

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