The recurve, an area of the vibrating plates just inside the perimeter, is carved thinner than the rest of the plate, in order to allow the plate to "uncouple" from the rib assembly and vibrate more freely. Some makers carve this area deep and wide, others make it barely noticeable. This has a noticeable affect on the depth and power of the bass, but when overdone can lead to sinkage and cracking.
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