Two bookshelfs as center Kef Reference 5 and Kef R3

Phase cancelation/comb filtering come to mind.

You could use a single speaker though.

DeKay

@dtximages uhm use a sungular R3... Why would you want to have a comb filtered mess. PLease don't be doing things just based on vibes. use a singular R3

Ok so no due to comb filtering. I supposed that could occur but wouldn't that only be an issue if the speakers were offset?  Plenty of speakers use a similar design. All im doing is making a MTM configuration.  

Anyway, I guess i won't do that.. I just figured using one speaker woudln't be enough. I was amazed at how much difference a beefy center made in my other systems.  I guess the R3 is no slouch so I should be fine.

You can try it, but due to the upper coaxial driver design you cannot space the tweeters closely together.

If you don't like it you might try disconnecting one tweeter.

DeKay