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Have you tried mechanically isolating the cabinets,as in resting them on carpet or rubber, rather than putting them on, I suspect, a hard surface which may even be a hollow floor - creating its own soundboard. You say that the hum is still there even when no speaker is connected. This will eliminate a suspect ground loop, which incidentally, shows up as very ...


In general, the way you fix this is disconnect EVERYthing so you don't have hum. And one by one, plug stuff in and see when the hum starts. Even if a device isn't ON, it can still cause ground loop interference just due to the ground in the connecting cable. Although disconnecting your ground on the main wall plug MAY get rid of your hum, do NOT do that. ...

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