Originally Posted by Jrunr
Ok. What about sound quality between the SB13U sealed and the F113? I keep hearing about the musicality of the JL subs, (but those are usually more so on the f112 and not the f113). How does the SB13U stack up there? Also, would it take 2 of the SVS subs to match the output of the JL?
It doesn't appear that anyone else is going to try to help you with this, so I will take a stab at it. First, since this thread started in 2009, there have been a lot of blind tests done with both ported and sealed subs, and people have not been reliably able to identify one from the other when playing at equivalent volumes. And there are more fundamental differences between ported and sealed subs than there are differences among various sealed subs. So, as far as musicality is concerned, I would be very surprised if you could detect even subtle differences between the SB-Ultra and the F113. The F113 might have slightly more output than the SB, but the differences there would be pretty modest, IMO.
As a general rule, when comparing sealed and ported subs, from the same maker for instance, sealed subs are smaller, lighter in weight, have better WAF, and cost less. Ported subs, are bigger, heavier, and more costly to engineer and build. Sealed subs generally have more output from about 50Hz and up, where demands on the sub's amp are less. So, for music involving acoustical instruments, they work extremely well, and give lots of chest punch (typically mid-bass, from about 50Hz to 100Hz). Ported subs can be tuned to have lower frequency extension and play much
louder below about 50Hz than their sealed counterparts. So, depending on room size and listening volumes, they can be a better choice for HT, despite their larger size and cost.
If your goals are primarily acoustical music and HT at moderate volumes, a sealed sub should be a good choice for you, and there shouldn't be any meaningful difference between the two subs you asked about. If output is a consideration, the PB13 will produce much more volume below about 50Hz than either of the two sealed subs. Would you hear a sound quality difference between a sealed sub and a ported sub? Perhaps, but again, I am not aware of any blind tests that would confirm our ability to do so. So, moderate output--just pick a good sealed sub and either choice should be fine. High output--go with a PB13. Incidentally, Data-Bass has measurements of output at various frequencies if you would like to compare: http://www.data-bass.com/systems
I hope this is helpful.