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http://exciteawards.customretailer.net/product/2011/Da_Lite_HD_Progressive_1_1_Perf-335.html
Designed for applications where a more realistic soundstage is desired, this fabric allows for the installation of speakers to be placed behind the surface. With virtually no sound loss and excellent image quality, this fabric provides the same optical characteristics as the HD Progressive 1.1 screen surface with specially designed perforations to allow sound to pass through the material. The material has a gain of 1.1 and a viewing half angle of 85 degrees.
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http://exciteawards.customretailer.net/product/2011/Da_Lite_HD_Progressive_1_1_Perf-335.html