Originally Posted by mthomas47
Two PB13's could be very nice. As you consider your options, remember that you can turn the subs 90 degrees to make them fit better in tight spaces. I have PB16's with a nearfield (2') PB13 and they play very well together. I also find that most of us adjust very quickly to the size of the large subwoofers, particularly if they have good proportions and a nice finish, as the big SVS subs do.
There are a number of bass enthusiasts who deliberately put subwoofers right up against their chairs or sofas, with the drivers and ports firing directly into their backs. That greatly increases the tactile effects. But, others turn subs to the side to make them fit. If a PB13 (or a PB16, for that matter) is a tight fit in the space behind your couch, turning the sub sideways wouldn't affect what you hear at all, and you would still get increased tactile energy from the close proximity.
Agree with Mike. On a similar note, I am not sure if using a SW-12 together with a PC-13 (or two) is optimal due to the differences in spec and design (ported vs sealed), LF extension, etc etc. It is possible that it will work OK but only after some experimentation. I would check how the combined vs individual output looks like, using REW or similar software. I would not be surprised if you get a better result (output + low end extension) with only the PC-13 alone (or even better: 2x PC-13), without the SW-12. At least this is my experience from trying to combine a Velodyne SP-1200 with two PC-13.
Currently I have two PB-16 as my front subwoofers and two PC-13 as back subwoofers in approximately equal distance from the MLP. Running all subs in "extended mode". Even that setup requires quite a bit of experimenting with phase and volume before it will sound "optimal".. After measuring each sub individually (with REW), then in pairs and then in 2xpairs, and setting gain and delay for each pair in an attempt to optimise LF extension and minimise cancellations (using MiniDsp DDRC-88BM), I finally ran a Dirac calibration on the combined output for all 4 subs (one Dirac channel but on two separate output channels with different gain/delay). Now this sounds quite fantastic!
However, now I have just ordered a Lyngdorf MP-50 (http://lyngdorf.com/mp-50/
), which supports very sophisticated bass management in 5 channels! (front L Sub, front R Sub, rear L sub, rear R sub, + LFE). This will be much simpler (less boxes, less cables, less trial and error) and much more flexible/powerful than the MiniDsp in my setup. With that flexibility, combined with Room Perfect, I hope to experience something exceptional below 100Hz (and above 100Hz:-)