The Southern Jumbo is basically a fancier version of the J-45, with double parallelogram fingerboard inlays and a few other cosmetic differences. The Advanced Jumbo has the same body shape and size but has a longer scale length with a different, scalloped bracing pattern that makes the AJ both loud and very projective (loudness and projection are related but different qualities.) Advanced Jumbos also have rosewood backs and sides.
The SJ-200 is a larger guitar with a lower bout that’s 17 inches across. In my experience this body style is one of Gibson’s more hit-or-miss designs, with some examples sounding great and others quite muddy.
Hope that makes sense.
Wade Hampton Miller
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