Post #10And what about you, Jonathan? You have some serious firepower across the entire bandwidth now. Do single digits, while on a concrete floor and without transducers, add much to the HT experience for you personally?
Now that I have eight sealed subwoofers I still feel the same way. A quality 18" subwoofer ported/tuned to 15hz is exceptional and a couple of these units are all that is necessary for a front wall subwoofer in almost any circumstance. Those who step above that are the most avid of enthusiasts.
On a concrete slab the only way the lowest stuff (<~ 15hz) begins to matter is nearfield, and I mean a subwoofer driver cone pretty much needs to be right up against the back of your theater chair to make any discenrable difference. It's a goal not worth pursuit unless you just desire to have an absolutely overkill system that will get you funny looks from your friends and family. Folks trying to pursue subsonic ULF content with a single 12" or 15" or even 18" sealed driver are not going to meet their goal. Most rooms will need four sealed 18"s or even eight sealed 15"s or 18"s to even begin to feel anything perceivable in the subsonic ULF arena. That's my experience.