Originally Posted by Saturn94
Could you describe the difference in mid bass/deep bass balance you referred to?
I'm going from a ported sub, SVS 16-46PC +, to a sealed sub, PSA Triax. Having never owned a sealed sub (I've had my SVS for over 10 years) I'm not sure what to expect. I love that my SVS has strong output in my room into the mid teens and hope I'm not giving that up by going with the Triax (based on Tom's comments I'm hoping I'll actually gain output down low). The natural response (no EQ) I'm getting at my LP looks much like a house curve, meaning increasing gain as frequency drops (I like this).
Certainly! My XS15s are stronger in the mid bass relative to the deep bass, as compared to my own SVS cylinder (PC12-NSD). SVS ported subs are engineered to have a very flat response across almost their entire response, and I'm not an expert but I think that's an approach that works really well in installments that don't provide much room gain. For those environments that do provide a lot of gain, there can be a fattening in the deep bass and ULF that makes mid bass sound quiet and distant, and makes the low end crazy-thunderous. Some people can enjoy that balance when watching modern action movies, I know I think it's fun sometimes, but in my opinion the balance I have now--and, I'm guessing, that a lot of small-room HT owners with sealed subs have--is a richer, clearer, and better balance overall. A major part of this is also that I upgraded from a single sub to two subs, with one parked three feet behind the MLPs. WWZ is bonkers
Anyway the point is, I was also scared that I'd be losing something, going from a ported, steeply rolled off design to a sealed sub with a long, shallow rolloff; believe me, I fretted over the response curves for months! It turns out, in fact, that rooms like mine are nearly ideal for the latter kind of subwoofer. I'll only buy sealed subs from now on, as long as I live in similarly-sized apartments.
All that said, PSA's graphs suggest that the Triax has a hugely shallower rolloff than the XS15, implying that you would be losing even less of the deep bass and ULF as compared to your 16-46PC+ than I lost going from PC12-NSD to XS15 (depending on what your room is like, of course), and of course possibly gaining extension you've only fantasized about. On the other hand, I've seen several forum posters return XS30s in favor of XV30s, so personal taste is a major consideration. I'm very music-first; even in my HT, I spend far more time listening to music than watching movies or playing games. That may change if I ever get around to upgrading the sub in my music room. I'm looking hard at another XS15