front,rear, and tweeters makes a hissing 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=6356
Printed Date: July 05, 2025 at 5:45 AM

Topic: front,rear, and tweeters makes a hissing noise.

Posted By: htlee1019
Subject: front,rear, and tweeters makes a hissing noise.
Date Posted: December 07, 2002 at 3:42 PM

I posted up the topic about my tweeters making a hissing noise....come to find out its all of my fronts, rear, and tweeters that pick up noise.....i ran the speaker wires from the front right speakers ont he passenger side along w/ the power cable...and the speaker wires for the front left speakers on the driver's side along w/ my rca's for both amps.....and i ran the speaker wires from the rear 6x9s down to the amp....what could be my problem? i have brand new phoenix gold rcas for my 4 channel amp that i am using to push the front, rear, and tweeters.....

is there anyone that knows how to fix this problem??

Replies:

Posted By: NyxBass
Date Posted: December 07, 2002 at 4:04 PM

Check your grounds. Amp, headunit, battery. Everything. Try moving tha amp's ground, if feasable. Then you might look into ground-loop isolators.

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/NyxBass

Posted By: bberman1
Date Posted: December 07, 2002 at 5:37 PM

Did you use the factory ground wire on the back of your head unit? If so find a new place to mount it. Try and remount the amps ground make sure the surface is properly sanded so you have bare metal. Also unscrew your amp and set it on a surface that is not metal to see if the noise hissing goes away. Do these things and let me know the results.

Posted By: htlee1019
Date Posted: December 13, 2002 at 11:00 PM

What are ground-loop isolators?

Yes i used the factory ground for my new headunit. I will resand where i grounded my amps. My amp is screwed onto my sub box. I'll let yall know how it goes after i resand the surface. Thanks

Posted By: webguy
Date Posted: December 14, 2002 at 11:06 AM

You may need to reset your gains on the amp, if they are turned up too high.

Try this first. Disconnect the RCA's at the HU, turn on the system. IF there is still hissing noise, go back to where your amp is and disconnect your RCA's there. If the hissing goes away, then you need to rerun your RCA's away from any other wires (at least 6" inches away). If the hissing noise is still there, then your gains are set too high on the amp.

If that is the case, then turn your gains all the way down, plug the RCA's back in, turn the volume up to about 75% max volume (with all tone controls set flat - or commonly middle position) then adjust your gains (using your favorite hard-hitting song) till you just notice some distortion in any of the speakers. Then turn the gain control backwards just a hair.

If this doesn't work, then suspect the amp as having a poor signal-to-noise ratio, especially if it is an economy amp. The better amps will have a S/N ratio above 100:1. Check the specs.....

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