Originally Posted by jameskollar
My TV passes DD5.1 from the DCX just fine to my AVR.
You have your DCX going HDMI direct to your HDTV, and then you have optical audio out from your HDTV to your AVR? That's different than going from DCX through your AVR via HDMI and then on to your HDTV via HDMI.
Although I have the speakers on my Sony 34XBR960 disabled, when I activate them with HDMI input selected (coming HDMI from my Yamaha receiver, fed by HDMI from the DCX) I get no sound from the HDTV's speakers.
However if I connect the DCX directly to the HDTV via HDMI (bypassing the receiver) I do get sound from the HDTV's speakers.
I have a feeling the explanation here is, again, a DD-related story. In no case can my XBR960 handle Dolby Digital. It can only handle 2CH-PCM stereo, which it picks off of the ATSC audio stream when its own OTA tuner is in use.
I think that when the DCX is connected directly to the XBR960 via HDMI, the HDTV tells the DCX it can only receive 2CH-PCM stereo and thus that's the type of audio it is fed by the DCX over HDMI... and that is why I hear sound from my HDTV. It's actually 2CH-PCM stereo sound, not DD5.1.
Either that, or the HDTV is simply picking off the 2CH-PCM stereo stream from the combined audio fed from the DCX (including the DD5.1 audio as well), as it does when the ATSC tuner is in use for OTA broadcasts.
I don't know what the XBR960 would pass through to its optical output if it were fed directly from the DCX via HDMI. But I could perform that experiment, using the receiver (fed from the optical output of the XBR960) to see if it's 2CH-PCM stereo or the original full DD5.1 coming from the DCX being passed on through (even though I know it's not DD5.1 being heard through its speakers).
But when the receiver is in the middle the DCX thinks that the "connected device" CAN receive DD5.1 audio and so that's what it sends out over HDMI to be accepted and handled properly by the receiver. But this same audio stream then gets passed on through the HDMI connection to the HDTV, which cannot handle the DD audio. Hence I get NO sound from HDTV if the receiver is an HDMI relay between DCX and HDTV. Of course presumably the audio should be handled by the receiver in this case and not by the HDTV, so the loss of sound on the HDTV should be of no concern.
At least that's my explanation for why the very same source program playing on the DCX will produce sound from my XBR960 if the DCX is connected directly to the HDTV via HDMI, but will NOT produce sound if the receiver is connected in the middle. With the receiver involved the DCX sends DD5.1 audio over HDMI (which cannot be handled by my HDTV). With a direct HDMI connection to the HDTV the DCX sends 2CH-PCM stereo over HDMI (which can be handled by my HDTV).
It does not pass any sound from my JVC. It's not a DD problem. I don't *normally* use my TV speakers but again my TV plays sound just fine from the DCX but not from the JVC.
Unfortunately, my DT100U is in another room (connected to my computer). When I get a chance I will bring it back to my main HDTV area and run this same experiment, going HDMI (a) direct to HDTV, and (b) through my Yamaha receiver.