12 Pack (12x12x4)" Pyramid Foam Acoustic Panel for Soundproofing Studio/Home Theater

12 Pack of (12x12x4) Inch Pyramid Acoustical Foam (Color-Charcoal) for Soundproofing Studio/Home Theater Model 12P-12x12x4 For maximum sound absorption, the 4 inch pyramid foam is the product for the job. Excellent at absorbing low frequency waves, it provides maximum deadening capability and functions in the largest areas, like gyms or concert halls. Specifications Quantity = 12 Pieces Size = (12 x 12) Inch Thickness = 4 Inches Color = Charcoal Grey Overall NRC: 0.65 Flammability Test Results Class A 25 Flame Spread Index 250 Smoke Spread Index   The overall NRC rating is the calculated average of frequencies 250Hz, 500Hz, 1000Hz and 2000Hz. > 125 Hz 250 Hz 500 Hz 1000 Hz 2000 Hz 4000 Hz Overall 1" Pyramid 0.14 0.13 0.31 0.43 0.46 0.54 0.35 2" Pyramid 0.19 0.22 0.45 0.55 0.60      0.76 0.45 3" Pyramid 0.24 0.29 0.55 0.56 0.61 0.85 0.50 4" Pyramid 0.28 0.39 0.74 0.69 0.75 0.96 0.65   Durabilit