I have decided to preorder an SVS PC Plus subwoofer, however, am having difficulty in deciding between the 20-39 and the 16-46. I fired off an email to SVS, and while it was a very good, thoughtful response, it didn't really help my decision very much, basically culminating in a 'you can't go wrong with either one.' The subwoofer will be paired with a Denon 3802 and Klipsch Reference Series R*3IIs all around. The room is approximately 18 feet by 15 feet, with about a 7.5 to 8 foot ceiling ( though it dips down to 7 on the left side). The room is enclosed on all sides, with two doors in the back (between back rears and next to the side left rear). The sub itself will be placed in a corner. I usually listen to DVDs at about -10 to -15 decibles on the receiver, however, I do crank it up to reference level when watching some new releases, action movies, or when showing the system to friends. The system is used almost entirely for watching DVDs, with almost no music played on it (and I'm not a fan of pipe organ stuff ). Finally, I want to know that I'm getting the most out of the bass on my DVDs and want the sub to nice and loud and also tactile, I want to really feel as well as hear the bass. Any help in deciding between these two models would be GREATLY appreciated! Thank you very much!