Would center channel benefit audio only room?

Or get a tiny room. ;-)

Until you give us more info/parameters of your setup and needs, it's not possible to help.

Kal

What a lot of pointlessly decisive answers to a vague question about an indeterminate system setup! Amusing.

Kal

"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

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

Dedicated? How will you derive a signal for it? Why do you think it will do anything for soundstage height, as opposed to central imaging?

The solution lies not in more equipment but attention to your setup, acoustics and, perhaps, speaker choice.

Kal