Hdmi vs Optical

Hi folks,
I've got an Apple TV that's connected to my Sony Bravia via HDMI and it seems to be dropping part of an audio channel. When I connect the audio using Optical it seems to work Ok.
The song that I use for reference is While my guitar gently weeps by the beatles. The weeping guitar and the also the main piano bit at the begining sound way off in the distance, like they're just getting picked up incidentally as part of another recorded channel. You can test it here: http://www.youtube.com/watch?v=F3RYvO2X0Oo&feature=youtube_gdata_player
The same thing happens if I play from It from iTunes etc so it's not a youtube issue specifically.
My question is if any body else has noticed this and if there is a resolution so that I can get all the sound coming through using hdmi to my tv?
Regards.

likely an issue with the tv
optical and hdmi are both digital interfaces
where the audio is 1's and 0's

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Message was edited by: Dman3284

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