Purchased these this week, and had them replaced with another set - which exhibited the same flaw. Two may be a curse, but they both did the same thing so I would be wary.    When on standby, the speakers issued a very low sounding 'ticking' sound (every 3 seconds or so), and the subwoofer exhibited a medium-frequency humming noise. (no, not interference - tried with computer off / router off / different rooms...same deal).   I expect that this is a build flaw, but for the price, not something I was going to put up with. Also - given there is...