Originally Posted by modesto66
Top end of budget is $2500.
These are the subwoofers that I have considered, but started to worry that many could overpower the room. I can fit one large subwoofer under a large side table sandwiched between two sofas. If I go with two subwoofers I need to downsize a little since the second one would be unhidden. The door opening is 7" x 36" As you can see I'm all over the map and seem to be frozen in making a choice.
1) Monoprice Monolith 15"
2) XTZ 3 x 12 (like because it would be the same brand as speakers)
3) JTR Cap 1400
4) Rythmik FV15 HP (intrigued by Rythmik since I live in the Houston area and they are located in Austin).
5) HSU VTF-15 H MK2
6) Rythmik LVX12 (2)
7) Monoprice 12 (2)
8) HSU ULS 15 MK2 (2)
7) or add another RSL speedwoofer to the one that I have. I have no fault with the subwoofer that I have, but it is my first and only experience with a subwoofer.
In a room size of ~2200^3, with limited placement options, I think that my two top choices would be dual Monolith 15's or dual FV15HP's (particularly given your location in Houston). I liked Chucky's suggestion of the Cap 2400. The price to output ratio is very high on that sub. But, it isn't just placement limitations that might prevent you from being able to get another one. It is also price. A second one will be even more expensive without a group buy. And, I really think that there are advantages to having dual subs.
The room size is an important factor in determining how much output someone will need, but it isn't the most important one, in my opinion. Of even greater importance is just how loudly someone likes to listen, just how hard he likes to push the bass frequencies when he does it, and whether there are specific frequencies that he really wants to emphasize. The good news is that in a 2200^3 room, you will be getting pretty good low-frequency room gain, below about 25Hz. That makes the extreme low-frequency output of a Cap 2400 less important, in my opinion. And, coming from a single 10" Speedwoofer, the subs I mentioned as my preferred choices will absolutely light you up, anyway.
So, in this particular case, I would recommend dual M 15's or dual FV15HP's. It might be a different recommendation if you were already coming from a single good 12" or 15" ported sub, and just weren't getting enough low-frequency SPL. But, you really don't know that you will need an inordinate amount of low-bass SPL in your room. That's why you started the thread, and that's why you said that you might even consider getting another Speedwoofer.
I would go as big as I could afford, but I wouldn't go all the way to a Cap 1400 or an FV18. What I would do is to go with dual subs, and the two I mentioned could be an excellent compromise between plenty of power, without being absolute overkill for your room and specific listening requirements.