Recommend speakers for a large living room

A little "out of the box" thinking here. :)

Given the size of the room and the hardness of the surfaces... why not use a myriad of well placed ceiling speakers,. with the requisite number of subs at floor level?

https://www.youtube.com/watch?v=x2ch8aQLwUY&app=desktop

Found this link that describes spatial qualities... see end of video for Laufer’s explanation.

Pity the audition is in the typical hotel room....

HO, line source speakers sound best in a large uncluttered space, more ’hall’ than ’cluttered’.  Not the typical living room with the usual 'living room accoutrama' .

Lines could work @ the window wall location; @ the circles, feeding into the dining area...*ehh*

*Oooo* Post #666! *L*

"The devil made me do it..."

Oh, BS...I can do fine by myself...*LOL*

With your budget and the amount of space to fill - hands down I would choose either the Sound Lab 845s, 945s or the Maggie 30.7s. Either, when set up properly ( in the location of your red dots would work great - just would have to experiment with distance from the wall behind and toe in) would make a beautiful, well balanced and detailed stage and imaging that would not shift, change, or collapse, regardless of where you are in the room/rooms.  Whether seated or standing anywhere near the sweet zone, either would present a very large, deep stage with pin-point imaging and timber to rival any of the speakers mentioned.
The need for massive amounts of power is a bit over stated. I can't imagine any tolerable sound level that couldn't be (with high quality) attained with a pair of Carver, Crimson/Raven 350 mono, tubes or a quality, high current SS amp.

If a low powered SET amp is your thing, I agree that the super efficient, very nice, open baffle, Spatial Audio X3, would be a great speaker for your large room/rooms. Un-rivaled in performance by anything even close to it's less than $8K price tag - would save you many thousands to put somewhere else. 

Jim