I stopped by my local shop this afternoon with a fistful of discs and gave a quick listen to Paradigm's DSP 3100. It was paired with an NAD DVD player and receiver, and a set of Paradigm Cinema series speakers; I'm not sure of the exact model, but they were probably the 110s - they were tall and thin. The sub was placed next to the listening couch.
The set up was on a raised platform in their main showroom rather than in a theater room; I would guess it was at least 30 x 60. So the room was very large. Not an ideal configuration.
The DSP 3100 has level, cross over (I think it went up to 150Hz), and phase knobs (phase is continuously variable from 0-180), binding posts and L&R RCA jacks. It is front firing with forward facing ports. There is a little Paradigm badge on the bottom front with a blue LED. (I'm not a big fan of random LEDs.)
I listened to some selections from Telarc's Handel: Messiah, and Telarc's Tchaikovsy's 1812 (the one with the real cannons).
The Messiah disc has some nice deep stringed bass. Sounded good to me.
The 1812 has the cannons, of course; appropriately floor shaking, and paint peeling. I actually felt there was good placement of the cannons in the sound field, too - one to the left, one to the right, one in the middle.
Finally, I listened to "Lord of the Rings: Return of the King" - from "Grond - The Hammer of the Underworld" (the big battering ram) through "The Battle of the Pelennor Fields" (the oliphant battle). Again, there seemed to be plenty of deep bass. The floor rumbled. Things shook and rattled.
However, there was something missing. It might have just been the room, or the front speakers, but I definitely was not getting a sharp punch, or crispness like I felt I should be. I think I was missing the frequency range from somewhere around 150Hz down to... say 70ish. I think that'd be called the mid-bass. I mentioned it to the salesman and he agreed that the fronts were weak in this area.
I have no idea where the crossover was set (in the receiver, in the subwoofer, or both) and other tuning parameters, but this lack of mid-bass really detracted from the overall experience.
I'm looking at the Paradigm DSP 3100 for a couple of reasons:
1) I have Paradigms for my fronts and surrounds (3se MkII and ADP 170)
2) I have a local dealer where I can audition, and they'll even loan me one for a day.
A couple things I didn't like about the DSP:
1) LED - I don't need any more light sources in my room.
2) Front firing. I have a young child and I _THINK_ I'd be better off with a down-firing sub. (Anyone care to comment on the trade-offs here?)
I don't know if all that helps anyone, but there it is.