Ok...i just got a Alpine MRP-F240 amp and i have a JVC KD-S790 head unit. Now it only comes with 1 set of pre-outs. Its just going to be powering four 6 1/2 speakers and im somewhat confused on how i should hook this up. I was reading about the amp can push 40Wx4 4ohm OR 50Wx4 Bridged 2ohm...