I agree with the recommendation for room treatments from GLK. Would be a worthwhile investment. If you still find the sound to be bright, I would think about home trialing a speaker with lower bottom end extension and a soft dome tweeter — Buchardt S300. Free return shipping if you don’t like it.
Very small room systems and synergy
I have been trying for 20 years to put together a system for a very small (10' x 12") listening room and still haven't gotten it right. I am currently using KEF LS50's with a NuPrime IDA8 integrated with moderate success. I realize I really don't like metal dome tweeters and I've been drawn to class D amps. This is probably due to my budget constraints of $2000 - $2500. Does anyone have any input for me on this?