12 Pack (12x12x1)" Pyramid Foam Acoustic Panel for Soundproofing Studio/Home Theater

12 Pack of (12x12x1) Inch Charcoal Color Acoustical Pyramid Foam (Color-Charcoal) for Soundproofing Studio/Home Theater Model 12P-12x12x1 For basic soundproofing, 1 inch pyramid foam provides moderate sound control on walls or ceilings, especially ones not parallel to the floor. This product is best for when absolute sound deadening is not required, but moderate deadening is desired. 1 inch pyramid foam is most effective on mid-to-high frequency ranges. Specifications Quantity = 12 Pieces Size = (12 x 12) Inch Thickness = 1 Inches Color = Charcoal Grey Overall NRC: 0.35 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