Strange crackling noises when MacBook is connected to an external stereo se

Whenever I use my external stereo set for audio output once in a while I hear some clicking noises from the speakers, sounds like they are switched on and off.
Is this a generic problem or a driver problem?
Thanks for advice!

This may be related to the issue discussed in this thread:
http://discussions.apple.com/thread.jspa?threadID=1394839&tstart=90
Bob

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    Dave M.
    MacOSG Founder/Ambassador  An Apple User Group  iTunes: MacOSG Podcast
    Macsimum News Associate Editor  Creator of 'Mac611 - Mobile Mac Support'

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