I might have learned something interesting about DD5.1 thru our TVs. Here's an AVS Forum thread
on a Monoprice HDMI switch that wasn't processing DD5.1.
On 03-08-10, "Weirdo" posted on how only one HDTV he knows of can process DD5.1 over HDMI:
"The only time this switch will ever work as advertised is either
(1) You TV can accept DD or DTS 5.1 via HDMI and can send EDID info [see our EDID help file]
to your HDMI source device like that. Your chance to get such TV is about 0% because I only heard about one such TV that is promised to come in the future.
(2) Your HDMI source device can overwrite TV's EDID handshake info and send out DD or DTS 5.1 regardless. I know PS3 allows you to do that and some cable HD box (SA8300HD running SARA software) can do that as well.
Otherwise, you will only gettting PCM 2.0 from the switch's digital out.
For what it's worth, my relatively old LG 37LC2D will pass through 5.1 audio untouched from the HDMI input to the SPDIF output. It worked great, even with my older Monoprice 4x1 switch. I used it that way with both TiVo S3 and PS3. (which properly detected support for DD 5.1)"
This was followed in the next post by RoboRay with this:
"Exactly. There are TVs that will do this, although it's certainly not a common feature.
The last device in the HDMI audio chain (the TV, in this case) is in charge. It's a little silly to blame the switch for not passing audio formats that your TV specifically told the source device not to send out."
So, it sounds as if the HDTV is in charge of the HDMI circuit and *most* won't process DD5.1 over HDMI but will over optical or coax digital?
* * * * * * *
I've updated the "Digital Audio" help file
with some prelim. info along these lines.
For troubleshooting DD5.1 problems, a note in an excellent series of short tips
(updated 5/10/10) says this:
"National Geographic and HDNet (if you get them) are DD5.1 24/7. If you get these, these are the best channels for testing if you have a problem with DD5.1."