I was using Monster Standard Juniors in my system for years - http://monstercable.com/productPage.asp?pin=149 - and have NEVER had a single noise issue. No whine, no headlight hum, no brake light pop, nothing. Well when I was trying to install that Altomobile EQ one of the RCA's got hung behind the dash and I had to rip it out which ruined it. So I figured Id run down to Pep Boys and get some Lightning Audio RCA's. 16' for $15. Twisted AND shielded. I figured if Monster's bottom of the line work flawlessly, surely Lightning Audio, who is a car audio specific manufacturer, will work just as well.
Well, I now have a brake light pop AND head light hum! Unf***ing believable!!!
So now I have to scrape together more money to replace the RCA's...again.
The only other thing it could be is the ground that I left hooked up for the EQ in case I ever get another. Maybe somehow its messed up. Ill pull it out and see if that helps but I kinda doubt it.