If you look closely you can see that Rocky George is using stacks of Mesa Boogie Half Back cabs
moreFor speaker cabinets, John uses Marshall 4x12 cabinets, Mesa Boogie metal grill "Half Back" 4x12 cabinets, Mesa Boogie 4x12 Recto cabinets and some custom made 4x12 cabinets.
moreThe half back is a great cabinet. The top is open and it is a big open combo sound with high wattage speakers. The bottom part of the cabinet is closed and the low end response is tight and also focused bass. The midrange is clear and the clarity of the speakers is crisp. There is no distortion with the high wattage speakers.
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these are greta cabs and I have been looking for one.... they're hard to come by
I had two. One was a top and the other was bottom. The cool thing about this cabinet is that the top two speakers are angled up.
I had the vertical 2x12 version years ago, but it was so hideous that I sold it, plus it wouldn't handle a superlead with the lower wattage speakers I favor. But I have wanted a 4x12 version ever since and never run into one.