Who makes speakers with relaxed high freq.?

If I could make a suggestion; if your room is bright as you suggest due to highly refelctive surfaces, I would suggest looking for a speaker that has less dispersion, therefore avoiding the bounce in the first place. You might look into a ZU Druid, it might have what you are looking for.

Good Luck

Dynaudio Contour S3.4 should fit your bill perfectly. Dynaudio makes arguably the best tweeter in the world.

Yes that would be speakers that use the Seas'.

Spica TC-60s and Martin Logan Aerius i's. I have both. Both have slightly rolled-off, non-fatiguing but nicely detailed treble. The Spicas are a bit more rolled-off than the Aeriuses. Both offer superb imaging. I've added a Behringer DSP8024 digital EQ to the Aeriuses, and it's brightened them up substantially, as well as smoothing out and extending the bass response. I like the EQ effect, but you might prefer the Aeriuses straight up. Got my five-year-old used pair in excellent condition for $1,000. My living room is pretty bright, with sparse furniture, plaster walls, and a rug over a hardwood floor.

Very tricky, you want small, good bass and smooth!
Sonus Fabers family would be ok, used of course, spendors are ok....these are very general answers of course....but get a pair of Ribbon based speakers and dont come much smoother than that, dont get duped as well sometimes.

I tried the some chinese ribbon design and they were bad...like really bad, bright and brittle. So design choice is vital, try a pair of used Apogees, you will die and come back alive. Its that smooth and detailed. Never hard on the ears ever not matter what the recordings are, even the original Queen stuff sounds good so.....

Good luck