Some production shots from the factory before they were loaded up :
You will note these have 16 vent holes in the frame vs. 12 on the prototypes and the surround is stitched on -- the surround material is also an upgraded material. Otherwise the cone / spider / frame are equal to the SA line. The motor and coil shrank down a bit -- so you can think of the SD-2 like a "mini-SA" line.
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