Right oh, where do I start!I've bought a new head unit to replace my old one. The one I had before has 3 seperate outs for my amp. (Front possitive and negative, rear possitive and negative and a seperate subwoofer outing possitive and negative). All gravyNow my new head unit has the exact same but only a single out for the subwoofer out. Why??? I need a possitive and a negative not just a single outing! Is it for a special type of amp which only needs one input for a sub?? If so im going to have to run my sub through the rear and 6x9's from the front output which doesn't sound half as good!Many thanks