What things would make you lean towards the 25-31? Is it because its a 12" instead of a 12"? Would it have just as good or better articulation, speed, and sound quality?
I'm a little skeptical of the 25-31 because it's a cylinder and I've never heard one. Also, I didn't find a measurement chart for the 25-31. The PB10 can go flat to 19hz, how low can the 25-31 go?
The 25 in 25-31 states the tuning frequency. It is tuned to 25Hz and you'll probably get 22Hz in room. The sound of the cylinder is not a concern. It is just a round box. Because of it's shape, they can make it much lighter than a box. For your use, I think I would still go with the PB10 as it has pr oven to be an overachiever. I believe the driver is based more on the Plus than the NSD.
I feel like the 25-31 would be too powerful for the room size, then again I guess you could always turn down the gain/volume... I just like the look of the front firing box subs more than the cylinder ones I guess.