Adding a 2nd center channel?

I totally agree with everything Kr4 said. However, if you just feel like screwing around (to see what happens ;--) you might try placing the two center channel speakers back to back; i.e., one pointed AWAY from the room, and with its speaker cable connection reversed (so that it's 180 deg. out-of-phase with the one pointed TOWARD the room.

It would especially easy to try in your case, because you could use one pair of the bi-wire cable to hook up (normally not bi-wired) to the front facing speaker and the other pair to hook up (reversed) to the rear-facing speaker. You'll be hooking up the speakers up in parallel, so just make sure each speaker has at least a 4ohm (or greater) impedance and that your amp can handle a 2ohm load ;--)

If you decide to try it, please report back. Thanks.

Neil
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I don't recommend 2 center channels.

Interesting idea Nsgarch. This is a variant of a center channel I own from Unity Audio (now Cerious Technologies) that has a rear firing tweeter. All the drivers are angled up on both front and rear, so play with that as well by tilting each speaker.

I see no reason for this except for novelty. Has anyone any reason to believe that any recordings are mixed/mastered for dipole/bipole center speakers?

GOOGLE DTS WEB SITE,THAY SHOW TWO CENTER CHANNEL OR TWO LEFT FRONT AND TWO RIGHT FRONT SPEAKERS.THAY SHOW DIFERENT SPEAKERS ARANGEMENTS FOR HT.