Dansai 852S doesn't play 6.1 DTS sound.

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I have a music DVD (Queen live at Wembley). It has 6.1 DTS sound. On the sound menu the options are Stereo and Dolby Surround. But whatever I choose there is no sound. If I play the DVD on my PC it will give me the same problem. But I have one player - VCL Mediaplayer- that gives me sound.
So there is sound on the DVD..
On the front on the Dansai there is a DTS label.
Doesn't this mean that the player has a DTS encoder and should be able to play DTS sound?
Can somebody help me to solve this problem?