i need some help please, I have a sony dsx ms60 head unit , a jbl ma6004 4 channel amp and 4 mm651um polks for my cabin speakers. i think that i need to hook my front and rear rca outputs from HU to inputs on amp and then wire my speakers from amp. So the real question is how do i wire in a powered subwoofer, do i use the aux ouput on amp and run rca cable from it to powered sub?? And if anything else i have said is wrong please correct me thanks for the help