Room size is 20 X 12 and looking to upgrade center channel. Mostly I watch movies and music videos.What center channel are you using now? That would be most helpful.
Suggestion for a matching Center channel for this setup would be appreciated.The CM Centre 2 would be an easy recommendation, but I'd consider doing an HTM2 like this...
https://www.ebay.com/itm/223583770285?ul_ref=http%253A%252F%252Frover.ebay.com%252Frover%252F1%252F7...
Or if you've got the budget and want to go bigger there's the HTM1...
https://www.usaudiomart.com/details/649537588-bampw-bowers-and-wilkins-nautilus-htm1-center-channel-...
Question - Does the center channel have to be B&W or can I go with something else? I am not necessarily looking for new speakers.No. But B&W makes some good centers, so for maximizing the chances of making a good sonic match with your CM10s I'd stick with the same brand.
Question - Can I try a full range speaker for Center Channel - laying it flat?No. A full-range speaker will be designed to sound best in a vertical position, so placing it on its side would likely be a sonic (and visual) mess.