Ive just bought one of these and probably going to send it back.
Do your units hiss audibly?
I’ve found that I have to mute the inputs to stop mine hissing. I can use inputs from my ada8200 and they sound fine, nice and quiet, but as soon as I unmute one of the UR inputs I get his, (which builds up the more UR inputs you un-mute).
I’m sure mines defective but it’d be handy if someone could tell me that this isn’t normal?