I have not heard the BIC, so really cannot say how good it compares to the SUB-1200.
If we look at Jman's review of BIC's more expensive H-100II, we see a resonance that is still ~80dB 50ms after the pulse:
Briefly, the vertical axis is frequency, the horizontal is time. A pulse is played and the duration of the signal is measured. I am not sure what the pulse duration is, but you want the sub to shut up as quickly as possible once the pulse is over. The colorful vertical bar to the right of the image is used to show how loud the signal is (for example bright yellow is 80dB).
Full review:
http://www.hometheatershack.com/for...5-bic-acoustech-h-100ii-subwoofer-review.html
The SUB-1200 is ~70dB by 50ms!
Full review:
http://www.hometheatershack.com/for...6-dayton-audio-sub-1200-subwoofer-review.html
As a comparison, we can look at the $500 SVS PB-1000:
That's right! The SUB-1200 has less overhang than the SVS! The ~22Hz port tuning is a little too resonant for my taste. The SVS may dominate the SUB-1200 for both extension and max SPL, but I would rather listen to the SUB-1200! In your smallish room, the SUB-1200 will give you the volume you need.
So you can see why I like the SUB-1200 so much!
For comparison, here is what I consider to be one of the tightest subs out there, the Rythmik E15HP:
You can see the SPL is below 80dB within ~5ms!
Note: Both the BIC and SUB-1200 have separate images for the port and the driver while the SVS and the Rythmik charts combine them (actually the Rythmik has no port). I really did not want to overly complicate this post by adding two more charts and this explanation. My comments are all still valid if you check the port charts (I posted the driver charts).