Hi folks.
I've had the Kemper for quite a while now and made a ton of Kemper profiles at a studio with a friend's Kemper before with no issues, but I finally moved on to set up my home studio to do profiles by myself. I even recently got the KPA DI box so I could make direct profiles.
So I set everything up by the books, turn on the amp and there is an extremely loud hum. I went through the manual time and time again and read the part about a possible ground loop and what not, but I can't seem to fix the hum issue at all. I played with all the ground/lift buttons on the back and tried several combinations. And it doesn't matter whether I try to make a studio profile with an SM57 in front of the amp or a DI profile with the KPA DI box.
I also checked the cables and tried all of them with a guitar straight into the input of the amp and everything sounds normal, so the hum is def being sent from the Kemper direct out/send. Pushing the ground lift on the direct out/send makes it worse - so if anything, it goes from very loud hum to very very loud hum. This is the lesser loud hum:
Does anyone have an idea what could be causing this? I am running my studio rig as follows: wall plug -> surge protector -> Furman M-8Dx power conditioner -> Kemper. The reference amp is also on a surge protector over in the next room.
I'm out of ideas. Hopefully some of you can help!
Thanks.
Simon