have you thought about using dual subs.. you will gain lots of headroom aswell as smoother bass over your entire room,,
i have the Premier Acoustics PA120,s and i love them,,, i was also looking at sound quality since i used to compete in car audio sound quality so to me proper bass sound was important but since i didnt have the money to buy dual 600 dollar subs i sacrificed just a lil but at the end i gained a lot..
here is a quote that i like in reference to multy sub placement
Dr. Floyd Toole: “That said, no matter how many subwoofers and how many listeners we’re talking about, equalization should be the final step to make it sound right. A single subwoofer can entertain a single listener with equalization -- good sound is possible. But once you have more than one listener, then you need multiple subwoofers.”