Only one channel working when playing music via iTunes

My Apple Tv has suddenly started only playing one music channel - ie depending on the song, you sometimes don't hear the lead vocal track, or perhaps drums.
It is linked to my computer over wireless, using plug-in wifi transmitters. When I play the song on the computer using iTunes it is fine. It is not a speaker cable problem as it happens when I play it just through my TV speaker. If I then turn on my home cinema speaker system, all speakers work but only play the one channel. I have looked at settings and can't find anything that would seem to cause this.
Both Apple Tv and iTunes on the computer are up to date with the latest software.
Anyone else experienced this problem, or any ideas on how to fix it?
Thanks.

Nocturno,
What sound card do you have now? If your using a Creative sound card, you can turn on the CMSS feature to upmix Stereo to a 5.1/7.1 soundfield depending on the capability of the sound card. If your using another sound card, you will need to check with the manufacturer if it had such upmix features.
JasonMessage Edited by Jason-CL on 02-14-2005 06:05 AM

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