can these be used with the soundprofessionals hat mount?
During the brief time that I owned both the CA-11 mics and a Sound Pro 'taper hat,' I did use them together with success. The CA-11 capsules are just about the same diameter as the AT853 capsules, and so you can get that size grommet for the hat and it will fit. It's true that the 'vent holes' on the CA-11 will be blocked by the rubber grommet, so when I used them together I pushed the CA-11 out a bit so that they wouldn't be blocked and it worked fine. The AT853 work better with the hat because the vents are not blocked even when the capsule is pushed right to the edge of the grommet hole (so that it is flush with the surface of the hat, perfect for stealth), due to a longer mic body, but still you can make the CA-11 work with it. It's just not as sexy.