Need some help/advise! I have a carpeted family room in my basement, 17ft. x 18ft. w/8ft ceiling and fairly closed off to the rest of the basement and I'm looking for my 1st subwoofer. I am somewhat limited by my "better half" who is OK with it as long as I keep the sub small. I have a $500-$600 budget and I've got my eye on 2-3 subs. I listened to the Def Tech supercubeIII and like it! I've also listened to the Martin Logan Dynamo but the sales rep wouldn't put it in the forward firing position so I really didn't get a good listen. Also I've read that the Sunfire D-8 is pretty good although I believe that sub has been discontinued. 70% movies, 30% music. Are these subs big enough for this room? Any opinions or experiences with these subs would be greatly appreciated!