I value practicality above the alleged SQ benefits, so I wouldn't buy subwoofers that don't cooperate well with reasonably sized sealed boxes. However, if I already had those subs, I'd just use 1cu ft per chamber, or maybe 1.4cu ft at best. It takes too much space otherwise. In the end, you normally can't buy a sealed box bigger than that. If I was willing to have a 2cu ft sealed box or bigger, I'd get the SWS-15 in a sealed box, or possibly something else in a ported box.