Speaker on its side as a center?

Try it. It will compromise horizontal radiation but only you can say if it is acceptable. I wouldn't do it.

Kal

Well if I actually had one and was in your situation I would have already tried it.---I wouldn't need anybody's permission.---I mean,how bad can it be?? Stick it on something like a coffee table or a box the size you need and give a try. Then decide on a stand. 3 identical speakers across the front can't be all that bad.---Just keep an eye out for the center channel police.

You might check with B&W to see if there is any concern from their end. If the speakers have any ferrofluid cooling that may prompt you to rotate the drivers. I had a freind that did it with his old Kappa &'s and the Emit tweeter failed about 3 mos. later. Upon reading the manual Infinity instructed the user to rotate the tweeter when laying the cabinet on it's side. Just a thought.

Not a good idea. You'll be relying on the speaker's "vertical" dispersion, which is usually much worse than its horizontal dispersion. Of course, most people use horizontal center speakers, which suffer from the same problem. The best center speaker is another of the front speakers, mounted vertically just like the others.