Humming Power Supply in subwoofer

[jlaubza]

Hi, I'm looking for advice please. I have a large powered subwoofer that has developed a low level but audible power supply hum (not amplifier hum) when operating. I assume it is the mains transformer. What can I do to eliminate this noise?

Thanks in advance.

 

[DavidC]

 

[jlaubza]

 

[jlaubza]

 

[Nico V]

 

[stephanvanzyl]