Both my amps A fender Deluxe with 1 12" speaker, and my new Peavey Trantube 100watt head with a 6505 Cab, have a buzz when I play the low E or B string on my guitars. Could the 7th string be blowing my speakers? I don't play loud, and have used different cords and guitars on both amps. Could it be something in the amps making the buzz and not the speakers? I would also think a 100watt head would not blow a 6505 cab, and it just started buzzing today.