Polk Magnifi Mini subwoofer - high frequency noise from subwoofer?

Hi,

I got the Polk Magnifi Mini, and I've noticed (actually since I bought it) that the subwoofer has this high-frequency noise coming from inside it.

Even when there's no sound coming out of it. It kinda sounds like a high-frequency siren noise.

Does anyone else have this issue? It's REALLY annoying, because I can hear it all the way from my couch, when it's quiet in the room. So I have to unplug the subwoofer.

I've tried to plug it into different wallsockets, but nothing helps.

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