Originally Posted by proudx
you mean the svs sb12-nsd (sealed box)?
I mean the one you asked about, the PB12-NSD at 20Hz. In my comments, I'm aware that I'm comparing sealed vs ported body designs.
So i would think 1 pb12-nsd would have higher spl output at 20hz that two uls 15s? Is that logic correct?
That's why the inclusion of the link to the calculator and the Xmax of the Hsu, ULS-15 so you can do the calculations for yourself. When one adds in the 5-6dB boost for co-location (within the length of frequency wave for 20Hz) and you add in the 3dB for the floor reinforcement, you have a more accurate performance figures for a sub in a Home Theater setup.
IIRC, the standard rule of thumb is, one 15" is equal to two 12" subs as to overall output, not including co-location boost and floor reinforcement. Between an understanding of co-location, floor reinforcement, the calculator and the information provided by data-bass, one should be able to get a decent idea of what's what with what. My subwoofer progression, in pairs is:
Klipsch, RW-12d > SVS, PB12-NSD > Hsu, ULS-15 > Funk, 18.0C.
(The Funk, 18.0C can be replaced by a SubMersive HP which has a pair of 15" drivers with, due to a longer Xmax (IIRC, 20mm vs 40.5mm), my opinion, a 3dB edge going to the Funk subwoofer.)
All of the above are in my opinion and all of the above are based on my flaky recollection of conversations with several different subwoofer manufactures. What is it you're wanting to do? Buy a SVS, PB12-NSD or a Hsu, ULS-15? ???
-Edited by BeeMan458 - 11/26/12 at 8:16am