Boston Acoustics Media Theater HUM. The problem may be the power source. Find another DC power source for the 12 volt. All I had was a 14.5 volt 4.5 amps source Model PS6 power source which fit the plugin socket. Absolutely no hum now and still great sound. However, I would recommend a DC 12 volt source with at least 3 amps output.
You could have an earth loop. This is caused by connecting the speakers and the computer or hi-fi equipment into different mains outlets.
To fix this problem, connect all the equipment to a single power-board and the plug the power-board into a single mains outlet.
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