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Old 14th November 2008, 11:29   #31
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Pencil thick power wire may be a culprit. It happened once in my case!
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Old 14th November 2008, 13:44   #32
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How did you do the Grounding for Amp? Have they made a hole under the boot and fixed it to the body through a Screw? Then possibly that would have rested and you getting the problem. Findout the mounting bolt of rear seat. Remove it and insert a new cable using a proper harness. Connect this Ground to your Amp ground after removing the old cable from your amplifier end. And check your problem got resolved.

Another possibility is the polarity of speakers. Is the polarity correct for all components ?

Remove all speaker wires from Amp end. Take a AAA type battery(Dont use your car battery it will blow off your voice coil ) and connect to the speaker leads. When the voice diaphragm pushing out, the wire connected to the battery +ve terminal is the +ve lead of that speaker. Check all speakers this way and make the connections at amp side. Hope this help.
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Old 14th November 2008, 13:47   #33
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^^

Reverse polarity wiring will not cause an amp to trip.
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Old 14th November 2008, 14:58   #34
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Quote:
Originally Posted by HotChillyPepper View Post
Remove all speaker wires from Amp end. Take a AAA type battery(Dont use your car battery it will blow off your voice coil ) and connect to the speaker leads. When the voice diaphragm pushing out, the wire connected to the battery +ve terminal is the +ve lead of that speaker. Check all speakers this way and make the connections at amp side. Hope this help.
Any way to check the same for tweeters in component system ? The out of phase and in phase stuff
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Old 13th September 2011, 12:50   #35
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Default Re: JBL 75.4 nightmare!!

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Originally Posted by ibm_jennifer View Post
I have repaired my Amp successfully and its working very fine now. If you need to source an electrician, I can help you in Chennai.
My amplifier is going crazy.
It plays for sometime and then the sub start jarring like never before.
Badly need a good electrician and a car audio mechanic.
Hope your guy still exists in the profession.
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