Proac K6 Signature, Sonus Faber Amati Tradition,Verity Audio Amadis, Kharma DB-9

OP,  given my (small to medium) room I have no problem to rock the Parsifal. As other Verity speakers, they are magic with natural instruments, but can also do amplified and electronic as well.
I suggest that you call Julien Pelchat of Verity to advise you regarding your room and placement, he and Bruno are gentlemen. The positioning of the Verity is very important and so much rewarding when you nail it.

@garebear IIRC: if I remember correctly
So you’re looking for a Lagavulin 25 years in a speaker... or similar!
Single malt wise, the Proac would be on the smooth side, but as they have lots of dynamics, they can bite. The Kharma are dryer and very elegant tasting, not as smooth and lush.The SF taste lush, plush, with the most elegant upper palate -- so much so they can become... unobtrusive

The Verities: it is the Lohengrin I was thinking of, I disctinctly remember three drivers in front. By the way, ribbon tweeters are nothing to worry about (the Proac has one too), at a mere 30W power (an easy load for modern drivers) you will be hitting around 105 dB which is very, very loud!

Of the four mentioned i would go with the Proac but i would also consider a large classic british monitor like the large harbeth or spendor to fill that large of space. You need a speaker with a large woofer and a bigger cabinet face to project the sound in a room of that size. You may even want to listen to some very good vintage systems in that size room, what you hear may really surprise you.

Hello speakermaster - thank you and I did research on Spendor's largest floor stander the ; Classic 200 but no dealer carries that speaker and it does not seem to be a speaker that is well coveted over here in the US. The spec's do indicate that it very well may be a veyt good speaker but is little to no information it. It really looked at that one for a long. Not a big Harbeth fan.

Have you listened to the Spendor Classic 100?  I imagine the 200 will have a very similar sonic signature, just with a bit more bass extension and power handling.  The Classic 100 already goes lower than some of your listed options.