I have an 1968 Ampeg B-25B cabinet with the original 15" drivers (2). There is a tear in one of the surrounds, and I tried the tissue+elmer's glue mend and it still buzzes. They're old as hell anyways and I want to drive my B-25 head into it pretty hard, so I want to put some new speakers in it that can take the beating. The dimensions of the box are 13"x29"x40", giving it a total of 8.726 cubic feet. The port on it is 4.25", with 2.125" for each driver (the two drivers are seperated inside by plywood and insulation, and the port has half the opening over each chamber). The whole thing is padded pretty thick inside as well. What speakers ought I look into buying? I need them to be 8ohms so I can wire them in series for 16ohms, which the B-25 head main speaker out requires. Like I said, I want to get some good thick overdriven tones from my head, which only has a pair of 6550's (~55watts). You guys offer great advice so I'd love to hear whatever recommendations you may have.