Aggrivated tinnitus from speakers?

I wish there was some easy inexpensive solution for you, but I seriously doubt it. Since vinyl is not as painful to your tinnitus as your streaming I definitely agree with starting with a tamed dac like Denafrips, even the entry level Aries 2. Then a dedicated streamer at least to the level of the Node. At this point, working with the room's acoustics in your current setup is unlikely to cure your problem. However, to tame the brightness, and contrary to the previous poster, I recommend more absorbers than diffusers. You can see my experience with room acoustics under my system.

I have tinnitus that comes and goes and, for the life of me, cannot determine any correlation to what may trigger it.  When it does bother me, I do not like to listen to headphones.  Between my two systems, one of them is in my basement man-cave with laid-back Elac speakers in a heavily damped room.  I can tolerate listening here a little better than my main system, where the room is a little livelier (but not by much).  I always listen at moderate volumes (in the 60s and 70s).

There are many things that can cause or trigger tinnitus, so the experience of others may not apply to you.  That said, your description of the room leads me to suspect it may be too bright with too much reverb.  For the clap test, put your phone in the listening position and record your clap (from the speaker position).  I suspect you might hear much more of an echo.  Your ears work to mask it a bit.

Also, have you tried the Wiim through your amp's DAC?

"have a very high frequency tinnitus at 18,000k."

I have RAGING tinnitus.

How did you get that number confirmed?

There is no "one size fits all" tip for managing/living with it. Try everything till something sticks.

Tinnitus here too.  Not severe though.  I usually use lower volume.  I even called the tinnitus hotline, but they never pick up, it just keeps on ringing.......

I am really sensitive to high frequencies, have been since I was young.  I’ve found speakers make a huge difference in listening fatigue, a ringing in my ears after a listening session.  I think you have gotten some great advice on room treatments, using an EQ and the DAC.  Even if you get that all “right” decent probability you’ll still need to address your speakers if they lean toward the brighter side.  I’ve tried to take brighter speakers and while making changes to the room, electronics, using an EQ helped, didn’t solve the issue.  
 

Soft Dome, silk tweeters along with various Ribbon tweeters paired with designs that trended toward a warmer, less analytical pull every drop of detail out of the music type speakers helped me out quite a bit, as much or more than any other change.  Once I got the speakers right, the gains made through room treatment’s, electronics were enhanced verses masking the issue when I had brighter speakers.  
 

I’d start with speakers so that you can then build around them when doing room treatments, making changes to electronics but you can also go the other way, do everything possible to make the speakers work and then swap them out but it’s a little like trying to modify an engine that isn’t really the best engine for the application to get it to work just good enough verses starting off with the right engine, then making modifications that only enhance the performance.  I chased trying to make several different speakers work in my set up because they were highly regarded and with the right recordings sounded breathtaking, best advice I got along the way from Audio Dealers was that you can’t cable your way, electronic your way (DAC’s, Pre’s, Amps) around speakers that for whatever reason, fatigue, sound signature, aren’t a fit for you.  Good News is that you have Mac gear, most of their gear is known for being more musical, less analytical, fatiguing, assuming the Mac already has their famous EQ settings, you have the right Pre / Amp to build around.  If you treat the room a bit, even without a speaker change, you should notice a difference, drop the right speakers in and should be a noticeable improvement, tweak your DAC / Streamer and that should be the whip cream and cherry on the Ice Cream Sundae.  
 

Good Luck!