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Discussion Starter #1 (Edited)
Hi eveybody, sorry if this post not belong to this area, I hope some one can help me.

I have Hitachi 55HDS69 but I have a problem using the optical output attached to my Rotel. I get only 2 channel stereo but when I try dolby digital 5.1 or DTS I can't hear a thing (nothing).

I have attached in the back of the Hitachi (HDMI 1/2) using HDMI v1.3 and v1.4 two devices:
1. A multimedia Box ''TViX 6500'' and
2. Video card inside my PC (a fresh install Win7 64) an ''ATI HD5770'', and I am unable with the 2 devices to get digital output 5.1 or DTS audio when playing my movies...

Example 1: if I play a movie from my TViX 6500 in dolby digital I get no sound but if I play a movie or a music video in PCM I have a great sound, but this sound is 2 channel stereo.

Example 2: if I play a movie in XBMC (Xbox media center) in analoge mode I get 2 channel stareo with out any problem but if I change to 5.1 again no sound.

The optical output from the Hitachi is connected to a Rotel Pre 1066 and Amp 1075, I use to have connected an old DLP Mitsubishi the same way without a problem but now with a Hitachi 55HDS69 I can't hear 5.1 or DTS.

Hitachi Configuration:
In MENU I have configured AUDIO: optical output = dolby digital and DRC = ON, but this 2 options are not available for me to acces, they are like greyed out.
In OUTPUT CONFIGURATION I have audio fixed

I can't find any other configuration related to dolby digital or optical output in the menu

Some one in another forum tolde me:
''Your get 2 channels in your audio setup because your TV isn't capable of outputting (or pass through) more than 2 channels.''

But this is not logical, if this TV have an Optical Output this mean it can deliver digital sound!

I will apriciate any help, thanks in advance

Please take a look at this owner's manual screenshot:

 

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Most HDTVs do not passthrough a DTS or DD5.1 audio signal. It's make/model specific. See the following FAQ on the topic. Read the bolded part: The optical port is meant for the ATSC tuner in most HDTVs and not intended for passthrough. You need to connect your devices directly to the AVR for DD5.1 or DTS audio. There may be a setting in the TV you can change, or there may not.

http://www.digitalhome.ca/forum/showthread.php?t=17870


See also the following post, useful for those new to the forum - FAQs, Search Tips, Optimization, etc:

http://www.digitalhome.ca/forum/showthread.php?t=57741
 

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It will provided DD5.1 for signals from the TV's internal ATSC tuner (or PCM if requested for a receiver that can't handle DD5.1). The particular screen shot is mute on what happens to signals that go "through" the TV...

As indicated in the FAQ, with many TVs you get PCM or nothing for passthrough signals. Some (rare) TVs will passthrough DD5.1.
 
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