Presently re-jigging my set-up.
I have a NAC72 and NAP140 side by side, and a Hi-Cap2 sitting on top of the NAP140.
A couple of days ago after re-connecting my Hi-Cap2 it was humming.
As it is in a cabinet I cannot hear it and it is not affecting the audio sound.
Also today it has stopped humming. I have read the excellent thread from March 2019 about humming which is mainly a mains issue.
What is the best position for the Hi-Cap2 and should I separate it physically from the NAP140?.
Can also get hum from the HC if the transformer is loose or failing. Have had both faults in the past.
Thisā¦ is bad. Do not āstackā Naim units. Not recommended.
Any intermittent āhumā is very likely Mains relatedā¦ 
Looks like Project 2 is sorting out my āhi-fi cabinetā (it was planned).
I will reposition the Hi-Cap2 to avoid stacking. Thanks for the advice.
Fully agree with Ian. donāt stack them. Got a photo?
It does sound like an external appliance on your mains may be causing this - or in worst case someone else near your house. If it does it again, turn off all your other circuits and see if you can narrow down the offending appliance.
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