I just put me stereo in my van and my tweeters in the front are squealing a hissing noise....sounds like my alternater. I noise filter on the rca's going to my amp and it helped but is still there. The 1/0 power and ground are run away from the rca's and i have helix rca's which are supposed to be one of the best for sheilding. need help or this screach is gonna drive me INSANE

 

oil them i find that usually helps

 

How many amps do you have? How long is your ground, what gauge, and where is it grounded to?