My sub amp quit workin on me after a couple years of pushing it to its limits. (mb quart onx1500.1). So I want to run my sub (fi Q 15) off of my PPi 900.4 along with my front stage for the time being until i have the money for a new sub amp. I wired the sub up to 4 ohm and im going run the two rear channels of the amp bridged to the sub and than the front 2 channels for my components up front. This will work right? Just plug the sub RCA's into the rear RCA inputs of the amp and im good?