Hello Hawkeye,
I don’t have much of a choice in positioning my 938s, but I have them toed in, 20” at the nearest corner of each speaker to the back wall, and about 31” to the side walls; and they don’t sound bright to me at all in a fairly bright room.
I would have liked a larger room to maneuver these, but here are the dimensions:
12’ wide by 18 long by 9’ high (the room’s floor is stepped, farthest from the speakers, the seats are 14” high than the front where the speakers sit.
The sweet spot is in front where I sit and the wife goes and sits in the rear of the room.
I know not much help but Good luck