Earlier this year, I went on a jy spree to find Bose speakers and subs from 1st gen M6 and same year Nissans. The amp below goes to a 9" Bose sub from M6. I have the gist of the red, green and black wires, but what are orange yellow and purple for? Please be specific on color to function. I'm not using this amp for the Bose sub. I am hooking up a PA speaker to the amp.