No sound with Logitech Z5500

I conneted my Callisto with a Logitech Z-5500 speaker system. The optical input shows DTS sound in the Z5500's panel and I set the out as DTS in the Callisto's panel. But........... I get no sound at all when play a DTS dvd movie.

Do you know why?

Thanks.

Hi, Make sure the Callisto

Hi,
Make sure the Callisto is the default audio device in Windows before you open up your DVD player application. Also, you might want to open up your audio settings in the DVD app, and make sure it's set to output to "SPDIF" instead of "Analog" output.