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Equalize airflow pressure within speaker chambers Our POREX® porous flow modulators provide precise airflow control between speaker chambers and to the exterior of the unit, thereby reducing air pulses caused by speaker movement. Allowing a freestanding speaker system to breathe freely during temperature fluctuations, our flow modulators equalize pressure within the unit. Designed for precise airflow control, our flow modulators: Protect sensitive electronic and acoustic components–POREX® porous materials repel dust, water, sweat, oils and other liquids from entering the enclosure. Can be custom developed in three-dimensional shapes for increased design flexibility. request sample ask an engineer