Originally Posted by Bradley Smith
I currently have a single PB-2000 in a 21x22 room with an 8 ft ceiling. I am looking to upgrade my subwoofer situation. I can only do a single subwoofer setup in my current room. I have the Ultra Towers and Center. I originally wanted the PB-4000 but after seeing it in person. I am thinking it is just too massive for my space and my wife. LOL. So, I am looking at sealed boxes and do not like the way the PC-4000 looks. Would there be a night and day difference in low bass frequencies output between the PB-2000 vs the SB-4000 or SB16-Ultra? I am looking for that low impact for movies and I haven't seen a discussion on comparing the PB-2000 to the SB-4000 or SB16 Ultra. I was hoping the size/power difference would compensate for a non-ported design.
Originally Posted by ProblemHouston
Any insight on weather a single SB16-Ultra or single PB16-Ultra could keep up with a pair of MFW-15s in a 20x16x9 room. The MFWs are close 8 (or so) years old and am wondering if they are worth replacing at this point. I am wanting to go single to save some space around the screen. I am also moving from Rocket 850 signatures to some onwalls (Axiom M80) as well to clean things up. What do you all think?
I'm going to address both of these posts together, because the questions being asked are somewhat similar. @Jim Wilson
already answered the first question, and I want to reinforce his answer. Larger cabinet volumes, combined with porting, allows subwoofers to play frequencies below about 35Hz with (much) more SPL than would be the case with comparable sealed subwoofers. Ported subs also produce more low-bass tactile response (TR) than their sealed counterparts, even if the SPL at low-frequencies is comparable.
People who become accustomed to those low-bass tactile sensations may really notice if they lose them in moving to sealed subs. So, for people who already have ported subs, and who like what they do at lower frequencies, it isn't just a matter of comparing SPL between their current subs and prospective sealed subs. Ported subs may produce as much as 2 to 4 times the SPL <30Hz of a comparable sealed model, and much more low-bass TR besides
I agree that, for the first poster, upgrading to a PB3000 would probably be a good move. (Your PB2000 has much more SPL <30Hz than an SB4000, or even an SB16.) Personally, I would really try to make a PB4000 work. We all (including spouses) tend to become accustomed to larger subwoofers over time, and after a while we just treat them as pieces of furniture. That is particularly the case with subs which have nice finishes, such as the PB4000 in either piano black or black oak.
For the second poster, I would start with at least a PB4000, if I wanted to upgrade, and a PB16 would have even more SPL (and TR) below 35Hz than the PB4000 has. (It has ~3db more SPL below 35Hz, and it is a noticeable difference. Above ~35Hz, the PB 4000 and the PB16 would be equal.) I looked for reviews of your current subs and couldn't find much. A single PB4000 should handily beat those two subs below about 25 or 30Hz. But, I'm not sure about the mid-bass frequencies.
The nice thing about upgrading to a single more powerful sub is that you can always add a second one if you ever decide you need to. I know that's the opposite of downsizing, but most of us with fairly serious HT systems and interests have found that it's nice to be able to have options. And, when it comes to subwoofers, and having sufficient bass for movies, most of us have learned to never say never.
I hope this helps!