OK, thanks Matt, will give it a try.
Further experimentation in the meantime shows hum occurs in sub even when Montille amp (to which sub is connected) is powered off ... a bit puzzling. Connected the same sub to the speaker terminals of a Quicksilver monoblock, on same mains outlet, and there is no hum at all.
I have to admit that I have a lot of electrical 'stuff' in the man-cave, so probably due for a proper tidy-up of mains connections.
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