Looking for a speaker for my LM 845 Premium


Today I have the Tekton Double Impact, but now matter what I match them with there are some hardness / brightness in the mid range.
I am looking for a high efficiency speaker for my 30W tube amp.
sensitivity > 92db
impedance min. at any frequency 4 ohm.
My room 25m2

And if possible made in Europe, Why? because import from the US add 1/3 on top of the price, and more if it’s a very heavy speaker.
martin-andersen