Thanks OrangePeel!
PHIL O, I've only heard the SPL800 (of the subs you listed), and actually, I listened to them back to back. -No contest! LF-10 rules there! I brought the soundtrack to the movie 'Hook' (w/ Robin Willaims & Dustin Hoffman)w/ me to the AV place when I bought my sub. The first track on that CD is fairly short, but extremely dynamic and powerful. At the very end of that track, there are 3-4 very low freq. signals that completely overwhelmed most of the subs I listened to that day (including the SPL800 - I must have listened to about 12 subs that day). Quite frankly, the only subs (that this place carried) that out performed the LF-10 were the Velodyne HGS12 and HGS15. They also had a monstrous Martin Logan sub, but it was WELL out of my price range, so I did not bother listening to it. I decided on the LF-10 (vs, the HGS') because of the huge price difference. Keep in mind, this is my first setup and I firmly beleive that my LF-10 is an excellent, deep performer for the money!