I am glad you ask that. In practice they throw me a cord that I plug into my amp. It goes to this rack system that is on stage with us. It is loaded with stuff with a mini mixer on top that he mixes our monitors with. Which I have an app on my phone that I can mix my own monitor, but I constantly have to do that because they have access to the mixer. anyway. The cord goes to one of those rack things that is just for me. At practice tomorrow I will find out the name of the device that it goes. From there it goes digital cat 5 or something to the digital mixer.Um... are you sure it is actually a ground loop ? not your ric picking up rf ? as delivered, irc's are among to noisiest basses ever. I personally threw in the towel on them... My project space is near the utility closet in my house The air handler theoepws enough rf to drive a ric to buzz city. never, ever hear on a P Bass...
and yes, I did a fill copper tape shield job star grounding. swapped the pickups. swapped again gfor humbuckers - ah, that was quiet but with none of the Rick sound I wanted...
Every time it is miraculously fixed he goes to that rack or the mixer. We have so many sound problem sometimes. Repeated problem, I just hate when the finger gets pointed at me. From show to show I don't change anything. I set up the same every time with the same setting, because once I have it set the way I like it I leave it. I'm done. Everybody else is constantly making changes, pushing peddles, flipping switches, changing volumes.
We have a digital Mixer that you can set the sound on a specific venue, set it and leave it, when you come back to that venue. Same or more problems every time. Sorry I go from explaining, to venting in a heart beat.