ITunes 9 and Dolby 5.1 AC3 pass through doesn't work

I know that this is an old question. But for me, it still doesn't work. I can pass through Dolby Digital to my 5.1 Home Theater system in VLC Player or EyeTV without any problems. However, in iTunes it still doesn't work. When I select the surround audio track of movies purchased from iTunes, I get no audio at all or a completely silent Dolby 2.0 or 5.1 track. But I didn't manage to get real 5.1 sound. I tried to set the digital output to "Encoded Digital Audio" and selected 48 kHz which should match the right setting for movies. But it still doesn't work. What can I do? Thanks for your help!

Re Checked it.
Only AAC stereo tracks on bought movies are 44,1 kHz.
AC3 tracks are 48 kHz.

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