Mach audio system question
In order to get my full stereo sound I have to push a button on the rear controls (I think it says dual play or something like that). I'm have to do this everytime I turn the ignition on, otherwise I have just a couple speakers working. Is there anyway to permanantly fix this? I read in the manual and found something about pressing the 3 and 5, but I couldn't get that to work either.
Any suggestions


