If you're running into noise issues with nothing plugged into your speakers, it's possible this could be due to interference from a nearby wireless source, such as a modem or phone; typically this presents itself as a hum or buzz. One thing we'd recommend is turning off nearby components one by one to see how that affects things; this can help narrow down the culprit. If a particular component, like a nearby modem, is causing interference with the speakers, we'd recommend experimenting with placement of either the device or the speakers to see if moving things around alleviates the problem.

If you continue to have problems, don't hesitate to open a support ticket at the main support page.