I recently bought this a few days ago (first generation) and was going to try it out this weekend for a show and a rehearsal. The grill was buzzing badly so i found a thread on it and removed it. There is nothing between the plastic grill and the cabinet.... Wow I inspected the speaker and it had a clump of something on it. Really? It may be a non issue with speaker operation but i believe if i buy an amp brand new it should pass a quality check and issues like the grill should be taken care of by the manufacturer before i buy it. I took a picture.