Best alpine deck and suggested wiring for sound system with sub and 7 speakers three amps?

Alpine CDE 9880R it has 3 RCA outputs on the back for front, rear and sub, I got one for �200 with fitting and with having the 3 RCA outputs the bass is only sent to the sub and not to the 6x9's or components. I use a 4 channel amp for the front and rear and a 2 channel amp bridged for the subs.