Auralex 4" SF Pyramids-24
"As with 4 inch Studiofoam Wedges, 4 inch acoustic Studiofoam Pyramids are recommended for larger spaces, rooms with pronounced low frequency problems or where sonic accuracy is mandatory stronger acoustic absorption is required. Having 4 sides exposed on each pyramid also yields more sound wave diffusion, which is desirable in some spaces. Thus, 4 inch Studiofoam Pyramids will yield less overall dryness than 4 inch Studiofoam Wedges. NRC: .95 Qty: 6 panels Coverage: 48 sq. ft.Sugg. Adhesive Per Box: 1 Foamtak or 2 Tubetak. Available colors: Charcoal, Purple, Plum, Blue, Brown, Beige, Burgundy, Red, Orange, Kelly Green, Forest Green and Teal."