If you decide to get that amp, why run it at 4 ohms? Plus if you want to run the amp at 4 ohms, you will need dual 6 ohm subs if you still intend to use three of them. You can run 3 dual 4 ohm subs and have a final impedance of around 2.5 ohms which would would probably net you around 1000 watts rms from the amp. However, if you intend to do that, why not just get the BP 1200.1? Power rating will be about the same, you will most likely pay less, and the BP 1200.1 has a reputation of being a solid amp. Sry, but I can't supply you with a box. I simply don't have the area to work nor the tools. Remember, Subzone makes great pre-fabbed enclosures.