The STF2 is a very good sub, I used to have one myself. It's not a bad sub for home theater, it is certainly better than most subs in it's price class. I don't think it will quite have the output of the A2 though, as the A2 has a larger enclosure and a 12" driver. What that means is it will probably have a bit more output. I wouldn't be surprised if the STF2 was a bit tighter and cleaner, although I am sure they would both be good subs for either application.