Airtunes interference - terrible ringing noise

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I'm having problems with my airtunes. I get a terrible ringing noise coming through the speakers which makes it almost impossible to use. Does anyone have a solution? I've tried with 'interference robustness' but it makes no difference. The high pitched ring gives me a headache after 10 minutes and i have to turn it off. Ideas?
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Replay

Two things to consider:
o The power source, and
o Wi-Fi interference
On the former, have you tried plugging the AirPort Express Base Station (AX) in either another outlet or to a noise-canceling power strip?
On the latter, I suggest you perform a simple site survey, using utilities like MacStumbler or iStumbler to determine potential areas of interference, and then, try to either eliminate or significantly reduce them where possible.