Hi there, treble is very subjective I guess. I have no issues with it, can listen to my 1990 for hours without any fatigue, others will tell you the opposite.
I second the advice to buy with possibility to return them, but you may find there is nothing to tame.
It is also a matter of how you will use them. My 1990 sounds better with my lake people amp than the monolith thx, the latter being a bit colder and closer to fatiguing.
Another way to tame it is a passive filter like those sold on diy audioheaven, but again, try them first, you may love them as they are