ok here's whats up i have a 37' chevy sedan that i built myself and wired myself. stereo sounds great when car is not running but when it is running there is a loud buzz. It gets louder when i turn up the volume and rev the engine. running power dirctly from alt. to battery to amps to speakers. I have one fear when i bought the amps i went with reconditioned amps. Any thoughts to get me started?