I've never hooked up multiple amplifiers. I have mrv-340 4ch for fronts and mrv-420 2 ch (170WRMSx2 or 340WRMSx1 Bridged @ 2Ohms)for a R series 12" 2 Ohm sub. Amps will be mounted right next to eachother, how do I hook them together, 1 or 2 power wires, and how to connect the sub from amp to get all the 300+. Help