That's a bad*** custom box. I got two 15 CVR 4 ohms in a ported box pushed by a Boss 1600W two channel. It hits real good, but not chest rattling, heart thumping like I prefer. I believe I'm going to get me two 15" sealed Pro Box Rocks boxes and see what it sounds like then, if I can get one of my 15's cones/dustcovers to stop rattling.