Originally Posted by
Valentiaman
It's buzzing with nothing plugged in except speakers.
If easy to do, try temporarily moving the amp and speakers alone to another part of your house (i.e. a different part of the ring main) to see if the hum is still present. And ensure nothing else other than the amp is plugged into that section of the mains circuit.
Do you have any other speakers you can try? (sorry you may have already said). Even though it should not cause hum double check speakers are wired to the amp in phase. Is the buzzing coming from both speakers? If not switch them around.
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