ok. I have a sound problem in my car. when I rev the car, or just drive regularly, the pitch from the co-axials(the rear) go up also. when I floor it, the speakers make high pitch sound same as the car. what could be the problem? its annoying me now, and when I hit a bump or so, the pitch gets lower, but comes back again.. it sounds like a screech coming from the back, even when I'm idle the sound is there.. help please

 

bad ground(s). check the grounds on your amps(s) if you have any, or the ground at the head unit may be bad.

sand off any paint at the grounding points and resecure.

 

yeah i have amps, but which one is ground wire....

 

Lol, nevermind. Just remembered, i'll go see if thats the problem, hopefully it is