Would center channel benefit audio only room?

Refining speaker placement seems like a reasonable place to start before recommending purchasing another speaker and more electronics. It takes only five minutes looking at the Virtual Systems to see that it's not uncommon for speakers to be positioned improperly. More than a few people don't (or can't) position their speakers in a way that will create a correct stereo image.

onhwy61, the room size is 14 X 20, the ceiling is vaulted 8' at it's lowest level. My speakers are 3 way custom utilizing a Heil AMT tweeter. The soundstage is 3D left to right all the way across the room, but it is only 4ft tall.

"My speakers are 3 way custom utilizing a Heil AMT tweeter."

Hmm. All bets are off with such an unknown but adding another speaker to these won't elevate the soundstage (unless you put it near the ceiling).

Kal

Kr4, center channel near the ceiling is doable.

I was kidding.

Of course, you could go all the way and get a processor with Audyssey DSX to derive height channels and, even, a center.

Kal