Hey folks,
I was dealing with the beam of sound issue in my two 1x12 cabs, just like Gerry and Richard, but rather than just cut some foam doughnuts, I bought a bigger cab!!! YAY! bigger is always better, right? It's a Hughes & Kettner Vortex cab.
What? I have to carry this thing? Crap.
Actually, it's lighter than most 4x12 cabs, despite it's large size. It is constructed out of particle board, which scared me at first. However, it's built really well, in that the front and back baffles are sealed in the tops/sides of the cab, giving it a tight punchy sound.
The things that sold me were: Tight punchy gains, shimmering CLEAR cleans, and the light weight. Oh, and the cheap price, I got it for $80 USD. As soon as I got it home, I took it apart, cleaned all the dust (and beer) off the cones, and rewired it for stereo (dual mono).