Whenever I'm near them my guitar tends to generate hum. Once I switch them off and shift to my headphones the hum is gone. I've never noticed this before, considering I was always using a noise gate. Is this normal, or is the magnetic shielding fucked up?![Erk :erk: :erk:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)