My BeoCenter 9500 hums!!
B&O recognise the problem and came up with a particularly high tech approach.. Special feet! Part number 3103347 !!
Alternatively cut two squash balls in half and use them as feet. The hum is amplified by the surface the unit sits on and de-coupling it helps - honestly!!
Clearly there will still be some hum but it does reduce a lot.
Reference: 58
Created: 4th March 2007
Modified: 6th March 2007