I really did not expect acoustics to matter, yet perforation patterns, backing materials

https://www.scribd.com/document/1058932948/Leader-Boxes-Constructed-for-Generations-Hand-Fabricated-Copper-That-Doesn-t-Compromise-215768

I didn't expect acoustics to matter, yet perforation patterns, backing products, and panel midsts in metal ceilings tame reverberation while keeping crisp, modern-day lines.