Shortens the Length of the VP89 Mics, Fits All Three VP89 Sizes, Shortens Microphones up to 6" (15.24cm). The Shure A89U Adapter is used to shorten the footprint of the three VP89L VP89M and VP89S microphone models by up to 6 (15.24cm). The adapter is easy to use simply connect the capsule on one end and the output stage onto the other. The A89U is an ideal solution when using the VP89 microphone and space is an issue.