Video aspect ratios, screen masking and anamorphic lens systems - Acoustic Frontiers
New Motorized Masking System from Seymour-Screen Excellence Costs 50% Less, Available with 16K Ambient Light-Rejecting and 4K Acoustically Transparent Film Screen Surfaces - TWICE
Case Study: Masking That Accommodates Variable Projection Screen Sizes from Rose Brand
Seymour AV Fixed Frame AT Screen with AT Masking Panels Review | Audioholics