I got an 8" ported sub (Energy ESW8) with the Energy Take 5 set I got for a small bedroom, and it was just okay used that way with its limited extension and spl capabilities; in a large room it just doesn't come close to cutting it for me. I'd rather have a larger Dayton, at least a 12", two would be better, in a room your size. I care more about the performance rather than the box size, too. I currently have four large subs (15 & 18" drivers) in my living room....