I have a JVC KD-G401 head unit and just two rear speakers. The Head unit is 4x50 watts. So could I bridge the right front and back channels to drive the right speaker. And bridge the left front and rear speaker to drive the left speaker? Would this mean connecting a right positive with the other right negative and using the remaining positive and negative to the speaker. Then do the same with the two left channels? Would this damage the head unit? Cheers, Phil