So... I did a little bit a lurking but couldnt find much.
However, I have my sound card hooked up to my Z5500 using digital coax and its currently set on Dolby Prologic II Movie/Music, which sounds great and all but I want to hear what it sounds like on DTS and Dolby Digital 5.1.
It says that the Z5500 supports those 2 formats as well as the sound card (if im not mistaken). So why can't I set my Z5500 to DTS and Dolby Digital 5.1?
Ok a couple of things. Yes your sound card supports those formats but unless the source audio is in that format you can't 'upmix' to it. To use these formats set your xi-fi to use SPDIF passthrough for digital. That way the digital signal is decoded by the speakers. The speakers must be set to coax at this time and you will have to press 'effect' until it cycles through to dolby digital. The best way to test this is with a DVD. Use a program like power dvd and make sure it is set up to use SPDIF output. If you can't get this to work just set the speakers to use 6 ch direct and let your i-fi do the decoding, the signal will be converted to analogue earlier this way tho.
Well, I've done all the obvious. But I found the problem it looks like the Creative driver for vista doesnt support Dolby Digital and DTS signals. Awesome!
This driver does not support the following:
Decoding of Dolby® Digital and DTS™ signals
DirectSound®-based EAX games
6.1 speaker mode.
SPDIF passthrough is supported on Vista 32-bit only.
Applications from the original Sound Blaster X-Fi CD will not work with this download.