There is a well known situation that can happen with the 2-phase 240 wiring setup that is dangerous.

If the two sides that are 120V in respect to a single Neutral wire lose that Neutral connection somewhere, appliances end up running in SERIES with each other. This is not good at all, as one appliance's resistance may be higher or lower than the other line's appliance(s), resulting in all sorts of voltages other than 120 going to each. Could be higher than 120, could be lower.

Another situation, one that I suspect in this "mysterious" case, is that somewhere in the house wiring the Line and Neutral have been reversed. The wider blade of the socket should always be the Neutral and the Neutral should also always be Grounded back at the panel. If someone installed a socket and did not put the White wire on the Silver screw and the Black wire on the Gold screw, but instead reversed them, this could be the rather dangerous reason for that one speaker humming like that.

In either scenario, or whatever, the house wiring should be inspected by someone who knows what they are doing - pronto.


--Mac

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