I would leave the HT-75's in a theater system. For 2ch music, I perfer bookshelfs and a good sub.
To some, a true 2 ch music system would have no sub at all. It would be mains that reach into the 20Hz region with a very detailed, yet soft highend, coupled to an accurate, non forward midrange.
I have heard from a trustworthy member the the HT-75's are not graceful enough for music. They tend to have an over pronounced high end that can spoil music. I don't know how they go for bass and midrange though.
To be safe, I would look at a silk dome, or an over engineered metal dome tweeter.
SHeepStar