When I got these home I loved the sound. Then I hit the on/off button and it killed the volume but I could still hear white sound coming out of the speakers. So I tried contacting the company to no avail. I took them back to the retailer thinking they were faulty and got another pair. But they too did the same thing. It's a design flaw. As soon as you plug the wall adapter in you hear a "HISS" coming from them even before you turn them on! I returned them for another companies speakers that will turn off. I wonder how much energy they use if you keep them plugged in all day.I guess the only way to stop it is to constantly unplug them...