Here's a funny story for you: I got a new SWR Black Beauty last year, and being gigless, I haven't really had a chance to wring it out. Tonight I cranked it up a bit and noticed a weird rattle To make a long story short, it turns out that there was a Gallien-Krueger amp caster up inside the cab stuck against the speaker magnet. Sometime at Guitar Center it apparently fell through the slot port and bounced up against the huge magnet structure. OK, I get it pulled off. The more I look around, the more it's apparent that this "new" amp I bought has been worked on, which is OK, as it works fine (I think) and I know from the store manager that a lot of the new amps develop problems on the sales floor (think of it as burn-in) and are sent out for repair and subsequently sold as new, fully-guaranteed amps. I am relatively certain that this speaker has been replaced, however, and I should like to make sure that it is the correct one, as the BB uses an unusual four (4) Ohm 15" driver. As far as I can see, the only marking on the speaker anywhere is on the back of the magnet structure:: 130052 03 14 MADE IN TAIWAN While it looks like the speakers used in the SWR Pro-Series gear, there is no FMIC inventory sticker on it with the proper FMIC catalog number. My main concern is that this not be the eight-Ohm version meant for the Son of Bertha, which is the same except for the impedance. Can anyone help me out with this? Thanks!