Introduction to the special issue on sound absorption and diffusion: Modeling, measurement, and applicationa)

This editorial introduces the Special Issue on Sound Absorption and Diffusion: Modeling, Measurement, and Application, published jointly by The Journal of the Acoustical Society of America and JASA Express Letters. Bringing together 13 peer-reviewed articles from leading international research groups, this collection showcases the latest advances in the prediction, measurement, and design of absorptive and diffusive surfaces. The contributions are organized thematically, highlighting emerging directions, identifying persistent challenges, and offering perspectives for future research and practice in architectural acoustics.