Originally Posted by sportsfan14
I have a 12x15x8 room here and have exactly this problem.
Just got a single SB-3000 in and it's in optimal placement, calibrated with Audyssey, new marantz avr...
Music is amazing, but as I run sound tests, output below 40 hz is pretty limited. and ULF non existent.
To be clear, the music quality and higher bass 40-80hz is phenomenal...But I didn't really appreciate how much advantage ported subs have over sealed in moving air (duh).
I'm going to swap for two PB-1000s or one PB-2000 and would appreciate insights.
It's a pretty square room and I don't have a lot of dead spots...
Advantage of PB-2000 is higher quality sub with cleaner output, and probably enough output for the room, but has potential for nulls.
Advantage of two PB-1000s is massive ULF output, but won't go as low or as clean as PB-2000, with advantage of giving more even base throughout given my AVR has two sub pre-outs.
would appreciate thoughts.
First, I probably wouldn't characterize dual PB1000's as having massive ULF. With ported subs, the biggest limitation in low-frequency output is the tuning point of the particular subwoofer, since ported subs roll-off pretty fast below the tuning point. If you want strong low-frequency performance (massive ULF) you need to start with subs which have lower tuning points. The single PB2000 will have a lower tuning point than the PB1000's, and a single PB3000, will have a lower tuning point than the PB2000.
Frankly, if I were you, I would probably upgrade to a PB3000. It is a better sub in every way than the two models you are considering, and it will dig deeper than either of the other ported models.
If a single SB3000 sounds good in your room, without a lot of dead spots, then a single PB3000 should sound good as well. I would always recommend dual subs, where someone has the flexibility to position the subs properly for improved frequency response. (That is not always a simple exercise.) But, I would also recommend starting with the most subwoofer, and the lowest tuning point that I thought I wanted, for ported subs, and then just adding a second identical subwoofer later, if and when I needed to.
Again, if you like having a single SB3000 in your room, then you should also like having a single PB3000. The biggest difference is that it will have far
more low-frequency SPL and TR (tactile response) than the sealed model has. And, you would always retain the flexibility to add a second one later if you chose to. But, you would be starting at a much better starting point, in my opinion.
The question of whether to buy one better subwoofer now, or two lesser ones, is a question that nearly everyone wrestles with at some point. The advice to start with the best sub you can is, however, the best advice I know. I think that you had that in mind when you bought your SB3000. As you said, you just underestimated the low-frequency difference between sealed and ported subs.
I hope this helps!