I dont know lol. let me explain myself a bit better, as I was in a rush with the last post. when I had 4 standard speakers, when I turned the radio or cd's up, pretty loud, the Radio and Cd's automatically reduce in volume by them selves. I had bought new 4 speakers, installed them, and it still does it. I really dont want to buy a head unit either. its just annoying, you want to enjoy your song and let everybody else enjoy it too, but it just turns itself down. Also is it possible to install an Amp and/or sub going off the standard Headunit? Thanks in advance