Hi: I am buying some new furniture for my HT. I will have a shelf right above the TV. There will be about 15 inches of space above the shelf for my center channel. My main concern: This shelf has walls on the left, right, and back. There is also a top shelf above where the center will sit. So in effect, my center will be 'boxed' in. So my question to others: Does anyone have a similar setup for their center channel? Does it effect the sound negatively? I also have the option of ordering the furniture without the left and right walls if that will help. Any opinions? Thanks for your help.