I am having a loud buzzing noise appear when I use a Relay G90 wireless system with the GK Fusion 550 head. I have tried three different Relay G90 wireless systems along with different guitars and still getting buzzing. I have took everything out of the rack to eliminate ground loops and have the amp and wireless plugged into the same outlet. I have tried at different locations (Warehouse and other House) and still have the same result, BUZZ BUZZ BUZZ. I have changed cables out. When I plug directly into the input of the amp I get no buzz. I have tried all the wireless systems on my other rigs and they have no issues, no buzzing. Dose anybody have any ideas why this is happening?