I recently installed a cd\mp3 pioneer deck in my van 50watts x 4. Im only using two channel at the moment. I wanted yo install a low waty 8"sub to the other two channels but im not sure if the other two channels are brigable like some amplifier can.if the channels are brigable how much would the ohms come down to and if its possible which 8"sub you recommend. The deck is 4ohms each channel