Originally Posted by UncleDave52
Thanks for your help. How would this be listed in the receiver's features or specs? Do you know if the Onkyo 604 can do this?
For a full explanation of this topic, read this: http://www.avsforum.com/avs-vb/showt...1&page=1&pp=30
Short answer, it doesn't appear the Onkyo 604 is capable of applying PLIIx to a LPCM source via HDMI. The Denon's do (I own 2307CI which does and got it for $599 online). Yamaha 1700 and higher do too.
Here's my interpretation of the facts surrounding your original question...
5.1 LPCM over HDMI would require an AVR capable of applying PLIIx to an HDMI source in order to achieve 7.1 surround, as discussed above (something the 604 won't do, apparently).
However, if any HD-DVD were encoded with 7.1 surround, I believe any 7.1 HDMI AVR would be capable of filling all 8 channels passed as LPCM. I wouldn't bet my house on that, but it seems reasonable to me. But that's sort of moot since I don't believe there are any 7.1 HD-DVDs currently. So if you want to always utilize your rear surround speakers even if the source is 5.1, get a "Level 6" AVR.