Hello all, advice needed... recently got a new amp that is 50 watts greater than my cab... 450 head and 400 cab. Since i've been playing with that head and a VT Bass pedal, the cab has started making an awful buzzing sound, like screws are loose or worse. What is causing this and how can it be remedied? Been gigging the cab for 8 + years without this issue. thanks a ton for the advice!