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User rating, 4.4 out of 5 stars with 2164 reviews.
I've had this thing for years now, never disconnected power to either the transmitter or receiver regardless of what channels I am/am not using. All is still well, so I'd say no, it's not harmful.
Answered by Brandon 9 years ago
I've had my speaker kit for a while now and leaving it powered on hasn't hurt the device.
Answered by roharris33 9 years ago