Hey everyone please excuse me as I'm new to all this. My question is how to wire a 8 channel amp with a mono sub amp correctly with RCA's. I have a JL C5 component set up front with JL coaxels in the rear with a 13TW5 sub powered off a Pioneer 8100nex, JL Slash 300/4 and a JL Slash 500/1. Now my question is I want to start running active with a dsp which I'm not sure of brand yet. I was told I need 2 more channels to run active. With that being said my HU only has 3 sets coming out the rear. Was thinking about replacing my 4 channel amp with a 6 or 8 channel amp with a built in dsp. Just not real sure how you can have a total of 7-8 channels off 5-6 channels of RCA's coming off the HU. Any help is greatly appreciated and any suggestions of a good dsp.