use y rca splitters and put the two amps with the exact settings and run each amp to each voice coil i have this set up in my explorer but the problem is that im using old p5 sonys amps and i think im pushing like 650 rms and it supposed to push 800 rms combined and is still sounds pretty good im doing 139.8 db at the dash with windows open with this set up , my set up is 18 inch sx with 9.8 cubic ft tuned at 34 hz