Heil Sound SM-2 Shockmount for PR-30 AND PR-40 Black SM-2 Shockmount for PR-30 AND PR-40 Black "The SM-2 shock mount from Heil Sound is a flexible support system that helps suppress low-frequency rumble on the microphone line by absorbing and damping vibrations picked up from the studio desk or console The SM-2 microphone shock mount is designed for use with the large-diameter professional-grade Heil Sound microphones, including the PR 30 and PR 40 Its 5/8"" threads mount onto the PL-2T ""Topless"" and other mounts, for easy installation " "The SM-2 shock mount from Heil Sound is a flexible support system that helps suppress low-frequency rumble on the microphone line by absorbing and damping vibrations picked up from the studio desk or console