Where do you see 5.1? Are you talking about the S590? It's gonna output what's on disk, be it 2.0, 5.1, or 7.1, or 116.9.

From the Amazon description:

Sound you can feel
Experience the highest sound quality with Dolby TrueHD and dts-HD codecs which reproduce high-definition sound with 7.1 channels of discrete audio for uncompromised quality.8
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I didn't do it, no one saw me, you can't prove anything.