Originally Posted by avs9999
I have dual subs and listen mostly to music and I think by adding the second sub there was a significant improvement. Although, I was adding an svs sb 2000 to an old velodyne ct-120 so most of the improvement was probably with the better svs sub. But I plan to replace the velodyne with another svs sub whenever it dies. If you add a second sub I agree with another poster about adding a sealed sub. I think that would show greater improvement over two pb 1000's.
This is incorrect. Adding a sealed SB2000 to a ported PB1000 is a terrible idea and will result in cancellation in the low frequencies between 15-30 Hz since the ported and sealed subs would be out of phase. In other words, you would get less bass in this region with both subs than with just the single PB1000.
Properly set up, the PB1000 will sound just as good on music as the SB2000, perhaps better on certain types of music. The only place where ported subs "technically" lose accuracy in comparison to a sealed sub is right around port tune. I say technically because in reality, a 20 Hz port tune will have no effect on 40Hz+ music. So in reality, it is quite accurate to say that a sealed sub will be almost as good for music as an equivalent ported sub. I say this because 40Hz+ they will be about the same. Below that, the ported sub will play with more SPL and MUCh lower distortion for music that goes very low such as electronica etc. Low distortion and extra output will have a much more significant impact on sound quality than a little bit of group delay around port tune. I mean, if we are pounding out some 20 Hz electronica, we aren't exactly listening for the fine detail of a plucked guitar string or something. We want to feel it.
So what is the benefit of sealed subs for music? Well, ported subs are larger and more expensive in order to get a lot more output around 20 Hz(or whatever port tune is). If primary or only use is music which is mainly 40 Hz+, we don't need the added size, output, and cost of the ported sub. So the advantages are smaller and cheaper. Not better.
I have sealed subs...but not because they are inherently superior in any way to ported subs. I have them because I have large drivers and sealed cabs keep them in a small enough cab to fit in my living room. Larger cabs would also cost me extra money to build. So again, smaller and cheaper.
I know there are many with long held beliefs that sealed subs are tighter, faster, more accurate, crisper, punchier, tastier etc etc. Blind comparisons make distinguishing between ported and sealed equivalent to random guesses. Now if you can see your preferred alignment and know its the one playing, its going to sound way crispier.