Or allowing space for the transformers with the speaker. Coincidentally, this also allows a more even distribution of weight. A power transformer (the biggest one) is always at the far end of the chassis from the guitar input. In a tight combo cab, having the speaker at the opposite side of the cabinet allows the magnet to clear the big transformer as well as have weight over there so that cab doesn't tip as much when picking up by the handle.
People generally like to see the handle in the physical/visual center of the of the amp. Then when they pick it up they want to feel the handle in the centre of balance. That's how we end up with amps like the off-set JTM45.
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