When selecting a projection screen, there are some primary factors to consider. Ultimately it is the weave that will determine the quality of sound penetration and whether or not there will be a moiré issue with your projector (seeing a patterned image). Most acoustically transparent materials are not THX certified, and those that are certified are often extremely expensive.

Perforated screens use a strong PVC material that has been perforated with thousands of holes, typically less than 0.3mm in diameter. This allows sound to penetrate the material while stopping light from passing through to illuminate the wall behind it and create a double projected image that will ruin the presentation. Weave, however, is made on a loom similar to the way a bed sheet is woven, except the weave pattern must be at a certain diagonal angle. Woven materials seem to out-perform the perforated materials in regards to damping and are less prone to suffer from moiré.