The Sound Absorption Coefficient (SAC) measures the ability of a material to absorb sound energy as sound waves pass through it. When sound waves encounter a surface, they can be reflected, absorbed, or transmitted. The SAC quantifies the absorption capabilities of a material and is influenced by various factors, including the frequency of the sound waves involved.
Frequency Dependence and SAC - The SAC is frequency-dependent because different sound frequencies have distinct wavelengths, which interact with materials in unique ways. As a result, SAC values are typically represented as a range to account for variations in absorption characteristics across different frequencies.
To illustrate this for our range of projector paints, we conducted tests using a common building material, specifically a 12mm gypsum board, and obtained the following results:
Unpainted Board α = 0.04-0.07 and Painted Board α = 0.04-0.07
Both the unpainted and painted 12mm gypsum boards exhibited a range of SAC values between 0.04-0.07. These values indicate the level of absorption experienced by the material when sound waves pass through it. Importantly, our acoustic projection screen paints maintain the same range of SAC values as the unpainted board. This means that our projector paint range is acoustically transparent.