I've been having some problems with my surround sound on the GTD-120 using external audio inputs (aux1) from my Xbox 360 (and other game consoles).
Basically, when I power up the GTD and go into the DVD playback mode, everything works great. However, the second I switch to aux1 (or aux2), I lose everything except the front left and right speakers and the sub.
Now, after switching to aux1, upon switching back to DVD, the back and center speakers still are greyed out, and produce little or no sound. I've checked all the connections, and everything is fine (hell, everything works great UNTIL I switch the GTD over to aux).
What I'd really like to know is if the GTD 120 even supports dolby 5.1 from the aux ports, and if so, what is my problem and how can I go about fixing it. If it doesn't support 5.1 from the aux ports, then if anyone can suggest another reciever that DOES support 5.1 from the aux ports, for LESS than $150, and is NOT made by GE, that would be great.
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Dolby 5.1 is not supported via either of the Aux inputs. Be sure to check your main menu/audio setup screen to ensure that "stereo" is not selected. If it is, DVD's will not downmix, giving you only 2.1 stereo.
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The only way to get Dolby 5.1 audio out of the Xbox will be via fiber optic cable from the Xbox to a Dolby Digital amplifier - which will output a decoded 5.1 signal to a 6 channel amplifier and 5 speakers and one sub-woofer. I doubt the Logitech speaker system has a Dolby 5.1 decoder built in with the amplifier for under $100, but I can't say for sure. If the Logitech has a an optical (or TOSLink) input, connect it to the Xbox and follow the instructions below.
To configure your audio settings, follow these steps:
Start the Xbox 360 console without a disc in the disc tray.
In the System section of the Xbox Dashboard, select Console Settings.
In the Console Settings area, select Audio.
In the Audio Settings area, configure settings for analog output or digital output:
Analog output settings:
Dolby Pro Logic II: Select this setting for stereo systems or Dolby Pro Logic II-compatible systems.
Mono: Select this setting for systems that do not support stereo output.
Note If you have connected to Xbox LIVE and downloaded any AutoUpdates, the Mono option will not be available.
Digital output settings:
Digital Stereo: Select this setting to use digital stereo output.
Dolby Digital 5.1: Select this setting to use Dolby Digital output.
Enable WMA Pro: Select this setting to enable WMA Pro pass-through if your receiver supports the WMA Pro format.
Note You must use one of the following cables to support digital output:
If your TV is HD, you should definitely be connecting the component video cables (green, blue and red) from the 360 to the TV (the 321 will not do video pass-thru from component cables).
-Make sure you have a picture at this point. (TV switched to whichever input you connect the 360 to)
You can get an RCA extension cable for the audio portion (red and white) to connect to the 321 for audio. You could also connect an optical audio cable to the 321. An optical cable must be assigned from the system menu to work..
Let me know if this helps.
Make sure that you have the RC Cables (red and white) plugged into the audio ports that coincides with the component video inputs. If that wont work then try plugging the audio and video cables into the inputs for the satellite, since that works. That way you can isolate the issue. If it still wont work try using the XBOX 360 HDMI cable. That has both audio and video.
Ensure that there are no conductive material's (metallic thread, fine wire such as shielding braid)near your Aux inputs that may be shorting your connections. You could also try using an emory board or fine sand paper, or even a pot scrubber on your inputs and RCA plugs in case it's just simply dirty and hampering the connectivity.