GTPJOE u cant run the 6x9's off the amp for the sub, the mono amp is wired on the output on the back of the head unit for bass, u would have to make sure your head unit has pre outs for front, rear, and sub. If not u would have to get those high/low frequency converter and tap off your speaker wire, and then disconect whichever speakers u want to amp from the headunit, and run new leads to the amp.