If i remember it is about 18x15 w 8ft ceilings, some angled walls (not a pure rectangle).
We watch tv on the long wall hence our seating distance around 10-11 feet away. No room to move the chairs back any farther so getting a seamless soundstage has never been 100%. I was looking into the omnidirectionals to help with this along with the larger centre channel.
Probably won't do the omnidirectionals anytime soon.

"Those who preach the myths of audio are ignorant of truth."