Encompasses multiple strategies that improve the sound quality of indoor environments—especially large spaces like educational venues and open-plan offices. From decorative panels to inset (hidden) panels, wall tiles, peel-and-stick tiles, mobile partitions, desk screens, and suspended or direct-fix ceiling systems, acoustical solutions beautify a space while enhancing wellbeing through noise reduction. Materials vary—from polyester to wool felt, glass fiber, cork, and more.