Not sure if this is the right place to post this. I run an Ampeg 15" cab with an ampeg B2R head... I also have a Behringer Rack tuner and use an Electro-harmonix Russian Muff. The Problem is my amp "hums". i notice it gets louder when turning the highs/trebles up and gets quieter turning the lows up... (on my bass guitar)... i recently found out it was a fire hazard among other things to connect your amp head to your speaker with instrument cables and because i WAS doing this.. i thought that may have contributed to the hum.. but i have just bought some speakon cables and the hum is still there... it hums whether the fuzz is plugged in or not... im not quite sure what to do to eliminate this... help!!! all i can think to do is to quieten it by using the PAD on my head... argh!