The noise my made was, I think from the fans - it was a "whiny buzz." It only occurred when I turned the fans (S-Flex E and Yate Loon Med Speed) to anything lower than full power. Since my other fan controllers don't do this, my issue is with the controller. Only reason I use a controller is to turn the fans as low as I can get away with

Sounds like the version you have may still have this issue. I tried emailing Lamptron, but never got a response. I'll try the contact posted above.