Nice to see Dale's stuff getting some mentions here. They are truly remarkable speakers. The thought of crushing those cones I admit is a big reason for me holding off. Although I mainly listen in the mid-70db range with mid-80db peaks.
But as i mentioned a good friend of mine has had a set of TLS1's for over 10 years now and hasn't crushed them yet. He listens to a lot of jazz, fusion, and Zappa. His room is about 15' by 12' I'd guestimate.