Yeah.. Sealed subs are best for music purpose and good enough for HT in a small room also. We are just saying how inaccurate Ported subs sounds with music especially with PB series in SVS but not bad generally(to me it's worst). I have seen many SVS owners didn't want or haven't had a chance to hear Rythmik or HSU in similar range compared to SVS. I prefer them any day over SVS. SVS can match or better in lower notes but very weak in mid and high bass notes compared to them. Only SVS Ultra range performs better in all notes...
What you saw demo in Home cinema showroom is SVS PB12-NSD not PB 2000.. I too went there just last week thinking it is PB-2000 when he said it's PB2000 in phone call and I noticed it right away as soon as I entered the room. Asked him why this misleading and he said both are same. I didn't argue why they are not same since he has no idea about Sledge Amplifier STA-500D. Anyway sat and went through demo but oh my what a disappointment, PB2000 is much better even though PB12-NSD has high loud bass output. Like you said loudness is all it has except good depth or clearer bass. Velodyne EQ MAX 12 is much better than PB12-NSD. I went to audition PB2000 to check whether I am doing anything wrong but I am doing much better than showrooms.
I always prefer Dual Subs but I thought to try with single sub first before investing in dual subs. I also thought single PB-2000 would be suffice for my room size..