Myraj, I've never been a fan of sitting at a wall boundry.
BUT, I think you may be right that it is worth a try, so no beef. I have a small woolen tapestry (Peruvian, bought in mid '80s) on the back wall which tames a nasty echo. I have a short wall setup and the tapestry faces the speakers, over 25' away. I sit no more than 11' away.
I might add that making prescriptive recommendations like these are probably a bad idea, but that the owner in question should start experimenting and reading.
There is a substantial amount of setup 'wisdom' out there and it may even converge on a solution....that is have more in common than major differences.
I am in a tough room, very asymetric with NO symetry whatsoever in a room of basically 26x16 w/ceiling from 9' to 12'.... I recently started experimenting w/my Magnepan 1.6s and moved them closer (close as possible, actually) and realized an instant help. Now, I am slowly messing with toe in. Too much and the image, while solid center also seems to collapse and too little toe and I can get a center gap. I am about to 'break the rules' and swap the speakers L/R and put the tweeters to the INSIDE of the panels. This is a CardinalRule NOT to break w/Maggies but I'm going to do it anyway, since this worked one time, many years ago when I still used MG-1s.
I WILL repeat, however, that rooms of even multiples are 'tough' rooms. No amount of equalization can help a room like the OP's.....all dimensions are a multiple of what is the probable ceiling height....So the room is in the ratio of 1:1.5:3 This is bad juju and will be tough to optomize. Can we agree on that?
