I am not the first, maybe the first you have heard of, it is not the room, i have many other speakers none others do this.
It is the speaker, the tweeter was about 5db louder and I have fixed it.
The mid in the forte 3 was originally designed to play to 20khz (it was the tweeter in some of klipsch's cinema speakers) , none of the other heritage will ....
disabling tweeter in crossover, modifying mid crossover bypassing the low pass portion and repurposing a 1uf cap to reshape the high freq response some.
about 5 inches of wire and a little soldering is all that is needed, took me about 20 minutes to do the 1st one
also I had to get nosey and find that class D thread you are in and I purchased a ti eval board to play with , lol
I have way more amps than I need around here, tube, a/b, D at least a couple dozen