[Fegefeuer]

Open your manual and realize at page 31 that the v280 offens quite a few options via jumpers to combat hum or loops etc.

Try them out. Also try different sockets on the wall.

 

[Derivative]

Open your manual and realize at page 31 that the v280 offens quite a few options via jumpers to combat hum or loops etc.

Try them out. Also try different sockets on the wall.

good advice, thank you. I will experiment accordingly and report back.

 

[Derivative]

Solved by setting as follows:

1- Case ground-lift jumper to "ground"
2- XLR ground-lift jumpers to "chassis"

Not certain how the second one has an impact as I was testing without inputs, but the first change eliminated most of the hum and the second one took away the rest.
Happy this was a quick and effective fix - cheers for the helpful advice!