Of all the subwoofers I've seen, the majority of them have had no issues; it's been the cable between the subwoofer and the receiver that has been the issue. That, or it's something to do with the settings in the subwoofer itself. What I'm saying is that it's rarely a problem with the sub itself, so make sure you've checked all the other possibilities before you conclude that you've got a faulty subwoofer. The likelihood is that the issue is in your wires, power or the settings of the subwoofer themselves.