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The Port Cover is a tool designed to temporarily cover the vent ports on a pressure gradient microphone.
This is an experimental product.
This will drastically change the sound of many microphones! Blocking the vent ports can change the directional characteristics of a microphone, essentially converting a cardioid mic into a omnidirectional mic. Have fun with varying the directionality and frequency response of your microphones.
Compatible with many 19mm pencil type microphones.