So, I picked up my SB-2000 this morning, and swapped out the old sub. First impressions are, it's definitely.... different. From an aesthetics standpoint, I can't believe how small this thing is - it's tiny. I quite like the metal grill (I have cats, and this for me, ths is a godsend). And the rounded corners is also a nice touch. What I'm not a fan of is the power indicator light. I've stuck translucent tape on every light emitting display of all my gear, so I'll be doing the same with this sub. After re-running Audyssey and listening to a few music tracks, the bass didn't really jump out at me. I feel that I got more 'chest-thump' from my Energy 10.3. Having said that, I think that I have gotten accustomed somewhat to the slight boominess of that sub. The SB-2000 felt much more controlled and refined, no really calling undue attention to itself.
Next up was Master and Commander. This is where the SB-2000 really performed very well. The room-shaking output was present, but that wasn't what impressed me - it was the integration of the sub with the rest of the audio. Hearing how the sub delivers the 'quiet bass' moments, such as the running footsteps of the sailors on the main deck as heard from below, then ratcheting up to the recoil of the cannon fire, I could hear much more detail.
So, the sub didn't exactly floor me with sheer wall-ratting output, but it's definitely an improvement in sonic quality.
A few pics... comparison of the SB-2000 stacked on top of the Energy 10.3. They look similar in size, but the SB-2000 is definitely smaller.
Integrated into my HT system: