Q: How far should I place my speakers behind the CineWhite A8K/CineGrey 3D AT/CineGrey 4D AT and AcousticPro UHD (Acoustically Transparent) screen materials?

A projection screen mounted flush against the wall over a properly installed in-wall speaker will have a sufficient distance by itself. There will generally be about a 1” total distance between the speaker’s dust cap (depending on make/model) and the screen with a 5mm (.2”) spacing between an in-wall speaker’s grill and the AT screen material itself.