I have been reading up on supertweeters or very extended treble response and many of these designs garner great reviews - Volent VL2 (with LCY to 60k), Reference 3A Grand Veena (with Murata super tweet), Maggie 3.6 ribbon, add on Townshend super tweeter, etc.
The strengths of the Salk HT1TL or HT2TL includes world class drivers - the Seas mid/woof and the LCY tweeter, which which extends to 60khz.
Could some of the outstanding comments and performance on these Salk models (speaking from what I've read, I don't own a pair - yet) be related to the choice of the LCY very extended range tweeter performance? Since it's range is used to -3db/60khz in the these two Salk models, could that be some of the magic? - that you are getting the benefit of not cutting off the response at 20khz, like many other conventional tweeters?
There are a lot of very pisitive comments on having this very extended response, positively affecting what we hear in the conventional range of frequency response and what we hear.