what’s wrong with my amp

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=33559
Printed Date: May 10, 2025 at 3:09 PM

Topic: what’s wrong with my amp

Posted By: cdub
Subject: what’s wrong with my amp
Date Posted: June 09, 2004 at 10:36 AM

My amp quit working a week ago, I believe it has no output. It makes this hissing or whining sound whenever it is on, but no sound from my subs. The red LED still comes on and I checked the wiring and fuses and it all looks good. The amp is a Punch Power 1500bd and they are pushing two Kicker L7 12" subs, and I have had the system for about a year.

Replies:

Posted By: kgerry
Date Posted: June 09, 2004 at 10:52 AM

the whining sound you hear is probably an oscillation coming from the power supply.... i tend to suspect that you've blown the FET's in the power supply, if you had blown the outputs you'd know it ( smoking, fuse blowing, etc )

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Kevin Gerry
Certified Electronics Technician
MECP First Class Installer

Owner/Installer
Classic Car Audio
since 1979

Posted By: DYohn
Date Posted: June 09, 2004 at 11:08 AM

I agee. Sounds like the old input voltage vs sensitivity mis-match. Or it's possible you have fried the voice coils in the speakers and they are frozen.

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