AVS Special Member
Join Date: Mar 2007
Location: Long Beach, California
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I was hoping someone who subscribed to Blockbuster streaming would respond, but in lieu of a definitive answer, here is what I think. I can't seem to verify it with Blockbuster.
I believe that Blockbuster only streams in stereo. Their web site never mentions surround. It might be worth a call to their tech-support.
Are you sure you heard all three front speakers, and not just the left and right? Three-channel is not a standard format, but there is no reason that your AVR could not create the center channel from the left and right streams.
And Comcast does offer surround. It is easier for them, as they have end-to-end control of their network.