I recently got some free advice from a well-known speaker placement / system tweaking consultant.
My room as seen from my seating position:
The advice I got is that given that the room is open on either side of the couch I sit on (wide openings to the next room; not a doorway, much wider), I cannot “load” the room and thus this limits the ability to ‘get the most’ out of the system.
His advice was to use a ratio of .8 : 1 for distance between tweeters : distance from tweeters to my ears. That’s what you see in that photo. And I’ve followed Magico’s advice to start at 20 inches from the rear wall. (These are sealed box design speakers.) At 20 inches from the rear wall, this lets me have this configuration which is reasonable given the fireplace and Fraim location.
His other advice was to buy some sound absorbing fabric covered panels and for critical listening sessions put them on the back of the couch behind my head. When not in use they can be stored under/behind the couch.
Comments? I’ve also read that an equilateral triangle is a good setup, but he is adamant that .8:1 is right in this setup. Obviously I can move stuff around and listen for myself