Question about MTX Thunder 8302 Car Audio Amplifier

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Amp only plays during low engine rpm

I have a 75x2 MTX amp bridged to mono driving a pair of 10 in Audiobahn subs, the amp has worked fine for 4-5 years now, but in the past week or so it has been giving me a huge headache. I have a 5 speed truck and when I am (for example) sitting in traffic it plays fine, once I pull out and hit about 45mph, it quits...I replaced the wiring and I replaced the stereo with another one I have and no help. So I took an Alpine amp out of my other truck and it plays perfect in place of the MTX. The amp isn't losing power, I see the light on even when the amp quits playing. Could this be a problem with the voltage increasing from the alternator during higher rpm? Could the higher voltage be causing my problem to re-occur? What could my amp trouble be? Maybe a bad/shorted output? Please help!

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  • kevin fuller May 31, 2007

    I will try that, thanks. Since my post I have learned that if I turn on my headlights, or even my park lights for that matter, the problem goes away, so it is definitely and overvoltage type problem. So there is something within that amp that is labeled "overvoltage threshold" or something to that effect???? Is it a screw or what normally?



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Yes, the overvoltage...compounded by maybe an alternator that is also not operating within limits (Does your headlights or horn get brighter / louder?). look inside the amp for any adjustable device for OVER VOLTAGE THRESHOLD or similar and turn it slightly clockwise

Posted on May 31, 2007


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