can someone please help me with this problem that i've been having for about a year now. when i turn on my car sometimes my subs and tweeters whine. and at other times i hear no noise coming from them. i thought it was my ground wires at first so i rewired all of my ground wires and its still making the same noise. next i put my power wire on one side of the and my other wires running on the other. no help. finally i unhooked my subs and played my head unit and door speakers and what do i hear that same noise. so now, i'm wandering if its my alt, battery, or should i just junk the system and start over. or perhaps could it by my head unit. i have a pioneer 6400 series. please help, i'm tired of being embarassed by not having superior sound as i use to.