AVS Special Member
Join Date: Nov 2008
Location: State of Confusion - 98823
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If you want to ensure you get passthrough, do as I do, simply hook up the hdmi cable right into the tv from the source and the optical audio goes to the pre/pro.
You need to go back to your AV adviser and ask him/her what they meant by 'passthrough'. As noted above, its a term tossed about, usually without deffinition.
As for lossless audio, if your receiver has optical inputs that is as good as it gets provided the device sending the signal has the capability to send lossless signals.
What you may be missing is the ability to decode the latest audio codexs. Newer formats are coming and some are already here, such as Dolby Digital Surround DX and TrueHD and a few others I don't care to store in my head.
When all else fails - RTFM!
♫♫♫ Two Channel Rules! ♫♫♫