Originally Posted by AC2011
neutro, what size room (approx.) are you dealing with?
It's a weird room, half of which has a very low ceiling (where the HT setup is), and with a large closet in the middle, giving it something of an annular shape. The half with the low ceiling is quite small in overall volume at around 1100 cu ft but the total volume is around 2700 cu ft. And it's open to a large corridor so who knows what acoustical trickery is taking place.
My feeling though is that sound and bass in particular is contained quite a bit in the smaller half, which helps providing a very enveloping sound. However there is lots of reverberation with the low ceiling. Bass is ultra-powerful close to the walls (and when standing if you're tall! at 6'6" your head may be close to a boundary) but quite balanced once seated.
I am trying to decide between a single XS15, dual XS15 or an XS30. I'm dealing with about 2,900 cu. ft., so I'm afraid that a single XS15 won't cut it. But given I don't listen at high levels, I just don't know. Guess I could always order a single and add a 2nd later, but that would cost me a little extra in shipping, etc. over ordering both at the same time.
The XS15 is my first PSA sub -- I can only compare it to the SVS SB12-NSD, SVS PC12-NSD and SVS PC12-Plus. The SB12 was my first serious sub, and it's comparable to today's SVS PB-2000 with a few dB's less in output, but it's clear the XS15 has a whole lot more to offer than the SB12. It's also a very different sub physically -- downfiring, no grille, quite a bit larger, bigger driver, etc.
The PC12-NSD is at a friend's in a much larger room (which is basically his whole basement, interconnected). I have no idea what is the effective room volume but it sure is above 3000 cu ft. While it gives all it can it's just not powerful enough to offer the kind of experience I'm personally after.
The Plus cylinders (I have two of them in my main setup, the aforementioned 1680 cu ft room) are another thing entirely. They are ported, tuned to 16 Hz. While the room is small, it has a door frame (without a door) opening to a bit larger area and bass is felt everywhere in the adjacent kitchen almost at the same level as in that room, so I think the "effective" area is much larger. Each Plus would be more like an XV15se. I absolutely love the output it can provide below 20 Hz. Between the two of them they can make the house's front door rattle in its frame during Pulse's server scene. In all honesty they are overkill for the room.
So I'd say the XS15se is providing more output than the SB12-NSD for sure. Around the PC12-NSD's tuning (20 Hz), it may even have an edge, I'm not sure. The rooms where I heard each are so different it's hard to compare. One thing is for sure, the XS15se would trounce the PC12-NSD above 30 hz. However, the XS15se cannot match a 16-Hz tuned Plus under 20 Hz (and surely not duals) even with what looks like ample room gain.
As for sound quality, I'm really impressed by the XS15 -- even if I strongly dislike the audiophile vocabulary it indeed sounds clear and tight for lack of a better word.
I'm confident a single XS30 or dual XS15 would be great in your case, although 2900 cu ft is a bit big for a single XS15. As you say though, you wouldn't lose much if you wanted to try one first before ordering a second one (... of either an XS15 or an XS30). That being said I'm very curious about what a ported PSA would do.