A suppressor doesn't "absorb" sound. It slows down and cools the gas behind the bullet, so the gas leaves the muzzle with less energy.
The chain
When a cartridge fires, high-pressure gas follows the bullet out of the barrel. Without a suppressor it expands all at once, and that sudden expansion is most of the noise. A suppressor gives the gas room and a path. Each baffle turns and slows part of it and passes less on to the next chamber.
We think of a can as that chain of stages, not as a tube with parts inside. The design question at every stage is the same: how much energy does it take, and what does it hand on?
The blast chamber
The first chamber sees the hottest, fastest gas on every shot and erodes first. That's why the blast baffle in Proton Adapt and Proton Safari is 17-4 stainless, and why a worn one is replaced under warranty.
The system
A can is only as good as what holds it on. Gluon mounts hold the cans on rifles and Pion pistons hold them on pistols, all on one 1-3/8x24 rear thread.