@larsman What did you land on for rock speakers?
I agree with you and would not even recommend the 40.3 XDs that I own now if rock / hard rock is your primary genre, even with big SS horsepower. I don’t think that was Alan Shaw’s intent. As a matter of fact, they were designed to be satisfying at relatively low SPL’s, starting around 70dB to mitigate hearing loss / tinnitus, and I think he did very well achieving those design goals. But who wants to listen to ACDC, Boston (especially Foreplay/Longtime) or the Who at 70dB???
On the other hand, if your music tastes are varied, and you want to fill a room (even a big room) with some nice off-axis sounds as well as enjoy sitting in the sweet spot, Harbeth’s are pretty good all-rounders and definitely not fatiguing...but there are many other fine choices out there.