The best "mass air mass" soundproof assembly seems to have 2 panels. Sometimes you want more panels, for example, to better heat insulate a window. Then you get the "triple leaf" effect that reduces soundproofing.
You have to soundproof a square opening.
- Opening area = 1 m^2
- Depth = 10 cm
- You must use 3 reflective panels.
- Total panel mass = 10 kg
How do you space the panels and distribute their mass? How does the answer change when there are more panels?
It's the same as Problem 1, but you get 10 kg of absorptive material. How do you distribute it?
There's also the coincidence effect to consider.