Welcome to the forum, jcrogers2008.
For the rear wireless box, the head unit will only recognize and connect to one wireless rear-receiver box. So you'd have to hook both left-rear and right-rear to the same wireless receiver box.
I hope that helps, although it doesn't seem to be the answer to your solution.
--HDTech
I was wondering if anyone had any info on running 2 of these on one system, or if its possible. My living room is so large that it's not possible to run wires across it without looking bad. So my question is can your run right rear on one and left rear on another?

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