Bob, when you say 23" to the bottom, do you mean 23" to the floor or are you measuring from your eye level to the bottom of the screen?
If 23" from the floor, keep in mind that if you put the center under the screen that low if you have any more than one row of seats the people in back are going to hear very muddled dialogue. If that's the case, you might want to think of ways to mount the center above rather than below the screen. This was exactly my situation which is why I have mine wall mounted above the screen.
Jason
