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Quoting info at zoekeating <info@zoekeating.com>:
This really suggests that the problem is an external electrical field that may not be coming from your wiring.
the intermittent time is the curious part. if the buzz were constant
i'd be more suspicious of the speakers themselves.
but the fact the are quiet outside of 3pm-11pm....?
Do you have a battery-powered amp/speakers. Do you hear the hum through them, too?
A Furman power conditioner will filter out noise that comes through your electrical wiring but won't be useful on external magnetic (electrical) fields.
If the noise comes from your wiring it could be due to some kind of heavy machinary that runs between 3pm-11pm.
Do you get electrical interference from your car radio (when tuned to AM)?
I will be curious to find out what the source of the problem is.
-- Kevin