24" iMac with Bose Campanion III Speakers....strange noise?

Dear All..
Not sure if I am posting in the right place, but perhaps someone can help me anyway. I have an iMac which has Bose Companion III speakers plugged in to it. I love them....absolutely amazing sounds. So much so that my neighbour has been down to me 3 times to complain about the noise.
Anyways, my problem is this. Every 3o minutes or so there is a loud noise comes from my iMac (Bose Speakers). It is just on for 1 split second but it's loud. It's like interference or something...not entirely sure. I just wondered if anyone else had experienced a similar sound when using external speakers.
I'd be delighted to hear what is causing it so I can fix it. I have absolutely no clue what so ever...
Thanks in advance..
~RICKY

Do you have a GSM type of cell/mobile phone nearby? (like the iphone) - For whatever reasons, GSM phones emit some type of interference when they are searching for a signal, about to receive txt or calls are coming in.
i've had similar noises from my Harmon Karmon speakers attached to my iMac, I've also had the same types of noises from my car speakers/radio when my iphone is nearby. Just a thought, but if you have a mobile phone nearby, move it away and see if that noise persists..
Good luck..
Rudy

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24" iMac with Bose Campanion III Speakers....strange noise?

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