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There’s a relatively loud humming coming from one or both speakers. What can I do?
It sounds like you have a ground loop issue. An unwanted voltage in the ground between your devices. The most common is that the cables are of bad quality. If this is not the case, then make sure you connect all the devices in the same system so they are all powered from the same AC outlet. If none of this helps and you have a TV or set-up box in your system. Pull out the antenna cable and see if the humming goes away. If it does, then you need to connect a ground loop isolator to your antenna cable.
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