The w7 is designed to act like a 4-ohm, says jl at least. The mrp-m1000 give 1000w at 2 ohms, 600 at 4 ohms. I would assume 3 ohms would be right in the middle, around 800. Being that this is a 750w sub, anywhere from the 600-800 would be good. JL recommends 5-600, but they're obviously being...