Originally Posted by klamyo
My current setup in a 1900 cubic feet basement room.
2 x definitive technology bp-8060st
1 x definitive technology cs8040hd
2 x definitive technology sr8040bp
I feel that the woofers in the DT bp-8060st are a bit lacking for a lot of the blockbuster movies I like to watch.
I have the budget for a pair of SVS SB-3000. Would that be enough for my room size? Also thinking in the near future, I might move to a bigger room about 5000 cubic feet, would these be enough?
If you can stretch your budget a little bit more, I would recommend that you go with the ported models. If you can't afford dual PB3000's right now, then I would recommend that you buy one of the larger ported subs now, and a second one when you can.
There are several components to this. First, ported subs will give you a good deal more low-bass tactile energy than sealed subs will, for reasons that are explained in Section VIII-A of the Guide linked in my signature. Since you are in a basement, on a concrete slab, you will really benefit from that. A concrete slab, laid on soil, doesn't transmit tactile sensations (TR) very well. And, for blockbusters especially, those low-bass tactile sensations are a large part of the way that we perceive low-frequencies.
Second, when you move to a larger space, the additional <35Hz SPL that ported subs produce will be extremely valuable to you. As you move to a larger room, the room itself will not reinforce the lowest frequencies as much and you will really benefit from the extra low-bass SPL. A single ported sub can be anywhere from 2 to 4 times as powerful as a comparable sealed model. (The disparity in performance increases below 20Hz.)
Third, as noted above, it's partly a matter of room size and room construction, but its also a matter of how much you enjoy the low-bass special effects in movies. Since, you specifically mentioned the bass in blockbuster movies, I believe that you are a better candidate for ported subwoofers. You can always turn down the volume on a strong ported sub which has more low-bass than you need at a particular moment. Unfortunately, the reverse is not the case. You can't turn-up the low-bass and low-bass TR any higher than the native limitations of a sealed sub will allow.