JBL 75.4 nightmare!!

panky12345 · 14th November 2008, 11:29

Pencil thick power wire may be a culprit. It happened once in my case!

HotChillyPepper · 14th November 2008, 13:44

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.

Bass&Trouble · 14th November 2008, 13:47

^^

Reverse polarity wiring will not cause an amp to trip.

abhibh · 14th November 2008, 14:58

Quote:

Originally Posted by HotChillyPepper

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

Redface · 13th September 2011, 12:50

Quote:

Originally Posted by ibm_jennifer

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.

14th November 2008, 11:29	#31
panky12345 Senior - BHPian Join Date: Mar 2006 Location: New Delhi Posts: 2,697 Thanked: 172 Times	Pencil thick power wire may be a culprit. It happened once in my case!
	() Thanks

14th November 2008, 13:44	#32
HotChillyPepper BHPian Join Date: Jan 2006 Location: Bang_a_lore Posts: 666 Thanked: 391 Times View My Garage	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.
	() Thanks

14th November 2008, 13:47	#33
Bass&Trouble Senior - BHPian Join Date: Mar 2006 Location: Bombay Posts: 2,756 Thanked: 137 Times	^^ Reverse polarity wiring will not cause an amp to trip.
	() Thanks