Porelle® have a specific membrane which has been developed for acoustic vents - Porelle® Acoustic. This is a microporous membrane which has excellent sound performance and provides a waterproof breathable option to acoustic protection.
The non-swelling nature of this membrane prevents any contact with electronics which can cause static and sound distortion.
Porelle® Acoustic has been tested for use in microphones and headsets. Original sound signals have been recorded without the use of Porelle® Acoustic and then with the membrane. The 2 sound waves were compared and the results were almost indistinguishable, with little to no variation from the original signal.
Porelle® Acoustic still provides the original sound quality, with low distortion whilst protecting electronics. This can be vitally important in rescue and military situations were sound quality is of utmost importance.