Klipsch reference theater pack 5.1 wireless subwoofer issue

This is not a review, but a complaint of the wireless subwoofer.

The wireless subwoofer makes low but distinguishable noise when nothing is playing. It goes away in a few minutes of idling. Tried switching sockets, and unplugging receiver, didn’t work. Unplugging wireless transmitter worked, which led me thinking wireless signal is interfering with the subwoofer.

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