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Join Date: Oct 2006
Location: Wandering the intertubes, on the way to damnation
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I'm not sure I understand. The VSX-520 receiver is a 5.1 receiver - you physically cannot connect another pair of speakers.
So when running a 7.1 source into it via HDMI, it will down-mix the rear surrounds into the "regular" or "side" surrounds to provide a 5.1 mix for the 5.1 set of speakers.
Since you are in the Surround Music Formats forum, I should mention, in case you are not aware, that SACDs and DVD-As (and most regular DVDs with DTS or DD) are all 5.1 mixes. The most common source of 7.1 material is BD movies - even most BD music disks are mixed in 5.1, I believe (though I am happy to be wrong).
I suppose the DPLIIx modes are engaged if you tell the receiver you have a 7.1 source to allow you to choose various downmix implementations (maybe there are some downmixes that mix some of the side-surround into the front channels...I dunno, just guessing).
Can you provide more info about what you are trying to do (i.e. you do indeed have 5.1 speakers, you have a BD or SACD player model x, etc), and what kind of source material (SACDs, DVDs, BDs) you are wanting to play?
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