[LEFT]HkP and E..... The original 803 was the same cone as the 515 with a smaller magnet, cloth spider grey color and Utah stamped frame. "Early" 803 A cast frame small magnet, cloth spider,gray color and 515 cone. "Later" 803 cast frame, small magnet, cloth spider, green color, and slightly curvilinear cone. This is the same cone in the 604 c. The tell tale "marks" are that the paper hinges on the cone are of equal height. And of coarse the "viscous damped" cone. More important is that the cone received a "cone dip" which strengthened the first two or three inches and that in the A version they started to shorten the x-max to get more excursion and more bass. And all of this before the 803 B the 416's daddy ! ( I have a dead 803 A green frame that I just can't tear apart just yet, to see the voice coil height.) And yes the WC15R has a different voice coil diameter. But, is it the same cone profile ? The weight seams the same.
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