I didn't anticipate acoustics to matter, yet perforation patterns, backing materials

https://cristianflcl218.lowescouponn.com/why-the-hardest-engineers-specify-copper-custom-made-elements-that-prove-themselves-over-100-years

I didn't expect acoustics to matter, yet perforation patterns, backing materials, and panel midsts in steel ceilings tame echo while keeping crisp, contemporary lines.