Right it is making at least some noise even with just the Camplifier connected to it when the Kemper is switched off and even unplugged.
It also makes a similar noise when plugged into my Orange 2x12 so I suspect the Camplifier, my power or a cable now.
I’ve not heard it as loud as it was before but there’s a noticeable presence of something when it’s just left on.
Or would it be normal for the speakers to make some sort of noise when the Camplifier is on and plugged into them?