Re: M30 placement in a small room
Hi Ebenai, my room is a very similar shape to yours but with a large window on wall C and doors on both A and B walls. I agree with Keith that on wall C they will sound boomy. Mine are about 18" from wall A and about 8 feet apart, toed in towards the sofa to the right of the middle of wall B. I have found that symmetry isn't always a good thing with speaker placement and the slight displacement of the listening area due to the doors is actually useful in that the room modes are slightly different for the two speakers, giving overall a smoother bass response. I do find that a listening position slightly away from the rear wall will improve bass smoothness too.
"If all else fails, read the instructions"