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It's AC hum, arising from the fact that power from the outlet is alternating current (changes direction many times - 60 in the US - times per second.
Solution: Make sure that ALL active components in your sound system (tuners, CD players, amplifiers, etc.) are grounded. If they have three pronged plugs, plug them into a three hole outlet, WITHOUT a three to two adaptor. If no three hole outlets are available, use a three hole to two prong adaptor, but make sure the green wire is connected to a ground. If one or more of the components do not have a three prong plug, connect a wire from some screw in the frame of the component to a ground, or to a screw in the frame of some other component that DOES have a three-prong plug.
IF the component with speakers connected, makes a loud hum when it is grounded and no other components are connected, it's filtering electronics will need to be repaired. Same applies to other components is the noise occurs only when they are connected.
What else can I help you with?
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