Just sharing some measurements of the DT 1990 Mk2 from DMS here. Make sure to check out his review if you haven’t already
Measurements:
Producer Pads
Diffuse Field compensated - B&K 4128 & GRAS 43AG-7
Raw - B&K 4128
Raw - GRAS 43AG-7
Analytical Pads
Diffuse Field compensated
Raw - B&K 4128
Raw - GRAS 43AG-7