Unwanted radio signal through powered speakers

We plug our ipod into a small set of powered speakers and using the alarm function to wake up in the morning. But faint radio signals are coming through the speakers making it impossible to sleep. If we turn off the speakers, the ipod alarm is useless.
This also happens on receiver's Aux input running iTunes from computer downstairs.
Any ideas on how to prevent?
Thanks!

Almost certainly this a fault with your powered speakers and not the iPod. Something in the speakers is acting as a radio receiver.

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Unwanted radio signal through powered speakers

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