Amp noise

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=53514
Printed Date: May 15, 2025 at 8:24 AM

Topic: Amp noise

Posted By: ace customs
Subject: Amp noise
Date Posted: April 07, 2005 at 11:33 PM

I just installed a brand new amp for a guy today. It sounded fine for like a min. then it started this repetitive very loud bumping noise and would not stop unless power was killed to the amp or deck. Does anyone know what the problem is.

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Ace Customs

Replies:

Posted By: DYohn
Date Posted: April 08, 2005 at 12:28 AM

Could be one of several things: bad amp ground, amp input gain way too high (most likely cause) or bad RCA input cables.

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Posted By: ace customs
Date Posted: April 08, 2005 at 9:14 AM

I changed the rca cables, has a good chassis ground and what do you mean by input gain. the amp gain or something on the deck. He has a deh-p3600.

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Ace Customs

Posted By: mrmsudawgs
Date Posted: April 08, 2005 at 4:35 PM

I get a random bump noise from my Polk C400.4. It happens maybe three times a day. I've checked the wires two or three times - even tried to create the noise by jiggling the wires but nothing happened. I checked my ground with a meter and it checked out fine. I'm stumped. My system is perfect except for that once-every-now-and-then bump.

Mike

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2000 F150 Supercab Lariat, Alpine CDA-9831, Polk MMC570 in Doors, One Polk MM2104 Sub, One Polk Carbon C400.4 Amp.

John 3:16

Posted By: DYohn
Date Posted: April 08, 2005 at 4:41 PM

Amplifier gain = input gain.

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Posted By: mbemount
Date Posted: April 10, 2005 at 1:08 AM

ALSO, is the amp drilled in place into the frame of the car? Some amps if they are straight screwed into the frame or metal get bad noise in them and go crazy. Unscrew it from the frame if it is and see how it sounds. One of our installers had that happening until I told him how to fix it.

Posted By: ace customs
Date Posted: April 10, 2005 at 11:01 PM

thanks for the help guys it was the ground. There was too much paint in between the bolt and the metal. thanks guys

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Ace Customs

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