A: We have never done STC testing on diffusors, it isn’t commonly done as most diffusors are mid to high frequency devices (1kHz to 8kHz) and STC focuses on mid to low frequencies (125Hz to 4kHz).
A: Hi there, The NRC is stated below. 2" NRC:0.70 4" NRC:1.10
A: Greetings, 8 square feet per panel, 12 per box equalling 96 square feet.
A: It's next to impossible to cut and get clean lines, the best way to cut the material is with an electric carver. You can purchase TTPRO from Home Depot to adhere the material to the wall. Instructions will be in the box, or you can visit auralex.com.