front,rear, and tweeters makes a hissing noise.

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??

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

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.....