Monitor audio rsw12 hums for few minutes when switched on

micks_address

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Hi folks,
I have a ma rsw12 that has never really skipped a beat. Noticed recently that when power is cut to it and I plug in again I get a loud hum from it. The hum. Goes after a few minutes. The sub is nearly always left on so its not a huge issue but wondering is it a sign of trouble brewing?
Thanks,
Mick
 

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