Speaking of the Hsu system and STF-2, do you suppose that one reason music lovers seem to like the STF-2 is that it was designed to close the gap for the Hsu sub-sat system? This would suggest that Hsu made an effort to produce a more musically inclined sub that could handle the higher gap frequencies. I haven't heard one (just read the many posts here) so this is pure speculation on my part.

"These go to eleven."