I am trying to conect two rockford fosgate 600-4 amps to one set of rca pre-outs off of my pioneer HU. My HU only has a sub pre out and then another pre-out for door speakers ect. Someone told me to use Y-adapeters but I think that Y-adapeter will kill all of my SQ. Is there a device that i can buy to split this one set of rca outs into 4 pairs?