I do not believe that you can. If you use the "b" channel for the center channel, the "a" channel will not process the left and right channels simultaneously. It is either or, not both at the same time. It may be possible to run your E660's directly off the TV output adjusting the volume from the TV, while running the center channel through the Yamaha receiver and adjusting the volume for the center channel from the receiver.I hope this helps.
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