Why do I get a humming noise from my stereo speakers when I plug in airport?

Why do I get a humming noise from my stereo speakers when I plug in my airport?

Temporarily, please turn off your amplifier and/or powered speakers and disconnect the plug that goes into the AirPort Express audio jack.
Plug a pair of headphones directly into the AirPort Express and listen for a few minutes.
Do you hear the "hum" that way?

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