My audio and HT setup has been banished to my recently finished basement. 1700+ sq feet with concrete floors and concrete walls. Layers of finishings on slab and walls but my ceiling is almost 9 feet, so there is 14,000+ Cubic ft. HT is not a dedicated area, it's mostly open. Pool table, gaming space, BR, bar, couches and then HT on one end. Everything I need for long periods of spousal exile. BUT, moving my Revel B15 and Paradigm setup there has severely reduced bass experience. Will adding an additional sub or two produce significant musical and HT bass or is the space just too large?
I've never set anything up in this large a space before. Hoping it's not a lost cause?
A plan of your room would really help.
I highly doubt it is a lost cause.
One problem you have is that those subs are not good subs, and in no way suitable for that room.
Despite flowery reviews in the loony press, hard data shows they are not very good. They have a peak in the 30 Hz range and then drop off below 30 Hz and appear to be high passed at 25 like a lot of sealed subs to stop the driver bottoming. The bottom line is that I would not be proud of that sub design and I would not let it see the light of day.
In room that big sealed subs are not going to cut it, unless they cost a fortune like Perlisten.
Good ported subs will couple much better to the room and do what you want. A couple of really good ported subs will probably be fine.
You did not state what your main speakers are except the brand. Now, what is perceived as bass is actually above and far above sub range. In that space you are going to require really potent main speakers and a lot of amp power.
It certainly is possible to get really good sound in a large space, you just have to engineer for it. In fact larger spaces are actually easier to deal with than small spaces.
My room is five and a half thousand cubic feet and I have no trouble getting a good accurate bass. It is above sub range that I have to give particular attention and it takes a lot of power with a total of 3,200 watts. I don't think that is actually ever called for, but I have no trouble achieving concert levels.
Down stairs we do have a large great room space, of living room, kitchen, dining room a passage way and stairway. I can fill that space with an in wall system of 1000 watts. The sub is a 10" driver in an in wall transmission line. It does not sound bass deficient and can fill the space reproducing large pipe organs.
So it is just a question of getting the design right and that means attention to more than just the subs.