Been through a lot of threads. Understand that most of the base goes to the door speakers and that some capacitance helps shove it to the rear. Also see how to replace the rear speakers. Not sure I want to do that. Still seems to me that as I read it, from the Infinity HU the speakers and sub leads are wired together to the amplifier so that it all comes out of all the speakers. Have I got it wrong? Interesting that when I play my iPod through the Infinity system it sounds great. Regular radio sounds awful. No base in contrast to what others have said.