hey sorry i no like next to nothing about sound systems... i got 500 amp and a sub in back, in my vl when i start it with cd player on it makes a sortof screch sound and its intune with my car if i rev it teh sound will also go higher pitched?? wts doing this and how can i stop it??

pioneer headunit?

the sound is engine noise, recheck the earthing spots are clean (sand any paint back) and soldering in earth cables... also, make sure RCA's are run on oppisite side of car from your power leads

Mine does it to. Pioneers headunits are pretty good at doing this so I've heard. I dont really know the permanent fix for it, but turning down your gains will help it a lot.

as robbo said, run your power and rca's down oppostie sides of the car

i got told that its sumthing to do with static from the engine and u can buy sumthing worth bout 20 to 40 bux that covers sumthing on ur engine to stop static and u can also get it fro your batterie??

i had the problem years ago and bought one of these filters. biggest waste of money EVER. did a little bit less than sweet **** all. quickly learnt that wiring is a very important thing check the basics first. where are your power leads for the amp? where are your RCA's? does your earth run to bare metal?

i had the same problem once, it only happened when the car was running, was fine when just the ignition was on, rca cables and power were run down opposite sides of the car and all.. ended up being a bad earth i think, or maybe it was a bad amp, i cant remember, one of those two >.< lol

first fix your wiring, second check your alternator they whine and you can hear it thru your speakers especially when you accelerate.... same thing happened to me when i had tv's in my head rest on idle i could hear a loud as fuck whine.. it was the alternator put a metal pole on your alternator and put it to your ear and see if its coming from there.

If all fails the noise filters do work. I had a similar problem, had both power and rca cable running down each side of the vl but still didn't fix the problem. So I brought a noise filter, there very similar to this products on the website just for a example. Also you can by these from any car audio shop. http://www.electronixwarehouse.com/c.../noise-sup.htm (http://www.electronixwarehouse.com/car/accessories/noise-sup.htm)

its a eletrical leak (bad wiring join insulation, bad earth etc) i had the same problem! anything i turned on or off that was eletrical in my car would come through my stereo especially the subs lol easy to fix just a pain in the ass to find