It's with the TV 7.1 setup. The OSD sub does a good job for a 10 inch sub and if you believe this it's louder than the Dayton 1200.
Jman wrote a review a couple of years ago on it and liked it.
I have absolutely no reason not to believe you. I champion the SUB-1200 because I have heard it and am impressed with how it handles music, the price, and Jman's review. Now that the SUB-1200 is up to $150 (on sale at $137.50), it isn't the deal it was. I bought a pair discounted to $100 each before PE figured out they could not keep them in stock! But even at $150, it is hard not to like the SUB-1200.
The way I look at it, for anyone who cares enough about sound to come here for 2.1 speakers on a tight budget;
The BS-22 and SUB-1200 are a great combination for $275 (better if you wait for discounts).
If you have a little more money ($375), I would have to hear it from Jman or you that there was a sub (such as the OSD) which was significantly better, because the AA monitors are significantly better, and I would consider that the most worthwhile step up. The ELAC may dethrone the AA's or be fair competition with better marketing, but they are an unknown at this point.
Once there, I could see investing in a sub, but I'm not sure you are going to get real value for the extra money until you are paying for HSU, Outlaw, SVS, Rythmik, etc.
How is the OSD on other counts compared to the SUB-1200?