---Kal is right just above.
* With a new 3D HDTV, the HDMI Out from your Sony BDP-S580 BD 3D player goes directly to one of the the HDMI In of your new 3D HDTV.
Then just connect the digital Coaxial or Optical Out of your Sony BD player to the digital In of your Rotel surround processor.
You'll get the full 3D high def picture, but you'll get only Dolby Digital or DTS (compressed audio) 5.1 multichannel.
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- A new surround processor, with the latest (HDMI 1.4) would be your best choice for high res audio (uncompressed).
Even a receiver like the Onkyo TX-NR818 would be a great choice because it has all of that, plus Audyssey MultEQ XT32 (highly regarded and very sophisticated Room EQ), Audyssey DSX, and a whole lot more. ...Plus the street price is roughly $749, I believe (it lists for $1,200).
Or, you can get a nice surround processor like an Integra DHC-40.3 or their latest (DHC-40.4).
MSRP is $1,200 USD. But it won't have XT32 though. But I'm not sure regarding the latest 40.4 pre/pro. ...I would have to check their website.
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And like you said George, you can get a much cheaper receiver that would get you there (one HDMI cable only, for both high def picture and high res audio).
Six hundred bucks is good, much better than $250. That means the list price could be up to $1,800 (like the Sherwood Newcastle R-972, brand new, with a 3-year warranty, and TRINNOV). ...At A4L (Accessories4Less). And it costs only $599.99, but I don't think it does 3D though (so you would need a BD player like the Sony BDP-S790 with two HDMI Outs; costs only $180 street). ...Still that's 67% off! And it's brand NEW, plus 3-year warranty, plus the very hush-hush (high tech) TRINNOV Room Correction & EQ (you've got to read reviews and forums though to be up-to-date with that very particular A/V receiver).
...Or close enough, in that kind of line (caliber).
...Onkyo TX-NR3007 (2009 model) = $770 (list is $2,100). ...XT only.
I prefer the Onkyo TX-NR818 though (2012 model and with XT32). & it's $749 (A4L).
*** The 818 would make an awesome pre/pro, IMO. ...But it happens that it also has amplification for seven channels! Actually it is a 7.2-channel receiver, with two Sub Outs.
=> Check Onkyo's own website, and check the 818's own threads over at AVS Forum. Me I already did, and that is exactly why I mentioned it here to you (plus I know a thing or two personally about Onkyo/Integra products for the last thirty years or more; and in particular in the last six years). ...With Denon products too.
Anything else? :b