I’m autistic with relatively high sound sensitivity. I’m wondering if another autistic person in this community used any soundproofing in an apartment that actually reduced noise coming from a busy street. There are a lot of different products out there and I don’t want to buy something that doesn’t work.
“Lots” measured in mass. Buy your curtains by weight.
Leaving an air gap behind a cloth hanging on a wall extends its absorption frequency band lower because it makes it effectively as thick as the gap from the sound’s perspective. It also becomes a panel resonator with the air gap.
Oh wow, is this an area of expertise for you?
Hobby for 30 years.