Are you saying you've configured the system as having only L/R speakers, but it's still performing as though it is 5.1? If so, try a system reset and start over again.
EDIT: after looking at the manual for the HT-H6500, it looks like it doesn't have a way to configure the number of speakers that are attached. However, there is a Downmix setting on p17 for Normal Stereo. Give that a try. But, it's an HTIB and maybe it assumes you'll attach all the speakers and doesn't have configuration options like a fully functional receiver.
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Last edited by BIslander; 12-02-2015 at 07:34 AM.