I got a 4 channel amp. I'm wondering if I gotta run two sets of RCA's from the decks Pre-outs to the inputs on the amp? I got my components on channels 1 & 2, and Sub bridged on Channels 3 & 4.
When I turn my sub level up, my speakers get louder? I got 3 preouts on my Deck.
One of your 3 pre-outs should be a sub-out. Use a 2nd set to go from there to the channel 3&4 input of your amp. Set any internal xovers on the amp to LP and adjust accordingly.