Gonk,
in other words, it's doable, but perhaps not the most practical and effective approach? It would be as you described it; there's no way to manipulate the volume control other than manually, with the remote.
This idea began with a worry. The bottom of my TV sits about 40" from the floor. I'd like to place the center channel on the floor, under the TV, but worry that the distance might be too great and some of the illusion lost (with picture above and sound from below). I know some centers are actually built this way, to sit on the floor and point up, at an angle. Should I be worrying about this?
Thanks,
John