I ordered a Big Knob a couple weeks ago and when I got it, it had a constant noise/buzz-like typical ground loop issue going on with the monitor A, B and C outs while the Studio Outs where quiet as should be. Tried everything in the book to hunt this down since another monitor controller did not feature the same issue when hooked up here, and I took the BK to another studio where it gave us the exact same problem, so... After searching forums I found several people that had the same exact issue and it was due to nothing else than faulty units. So I returned this specimen and in the meantime borrowed a colleagues BK (probably an older one since this still had the Mackie logo on the front), which did not buzz BTW... After waiting for a week to get a replacement unit it finally showed up, and guess what... It also buzzed right out of the box! Any one else have a similar story?