Chief CMA348 BlackLarge Venue Vibration Isolating Coupler, Black The CMA Large Venue Vibration Isolating Coupler reduces image movement caused by common building vibrations like HVAC, foot traffic, road traffic and doors shutting. The patented design works as a projector mount vibration isolator by connecting two Chief CMS columns (1. 5 NPT) and limiting vibrations that are transmitted to the lower column. The higher weight capacity accommodates systems weighing 35 100