I just bought a used Gallien Krueger 410 RBH bass cabinet used, and it makes a buzzing sound from one of the speakers. I sent the speaker out to Orange Co. Speaker to get it re-coned, because I thought the speaker was blown. I got it back and buzz was still there. I sent it back to Orange Co. Speaker, and they re-coned it again. I just tried it, and the buzz is still there. I've looked for loose parts that would rattle in there, but I can't find anything. I upgraded all the wires to 16 gauge, which did nothing. I'm thinking of bypassing the crossover network next, but I figured it would be better to try to get some help first.