hi cap

If you can remove the cause of the hum (noisy SMPS, faulty fridge, dimmer etc, etc..) then yes, you can stop it.

I have a dedicated spur for my system (split off at the incoming feed) and have done all I can with stuff on my ring-main to eliminate potentially problematic items. I live in a village (i.e. not a densely populated area) and still suffer from audible transformer hum from my Naim kit on a regular basis, so if the problem (DC offset?) is being generated outside of one's own home; the issue will persist.

But ............ as Richard rightly advises, it is well worth putting one's own house in order.

Good luck.

John.

I currently test a demo HiCap - this is the only NAIM component in my flat that buzzes as if it was possesed. I like the effect it has but not the buzzing. And I have mutliple dedicated power supply circuits for each room where NAIM gear sits....

Adam, a dedicated power supply circuit just ensures that you get the same asymmetric mains as supplied to your house from outside.

I do realise that Huge. The reason I wrote the above is that a dedicated mains spur is not the panacea for buzzing HiCaps There are other aspects at play that need to be addressed.

Sorry Adam I misread / misunderstood your post (the dyslexia strikes again ).