If I recall correctly the maximum Noise Reduction Rating (NRR) for earplugs and earmuffs is around 30db. You can combine the two for a slight increase in hearing protection but you still hit a limit because of bone vibration.
Is there PPE out there to go even further beyond this? Where would it be commonly used?
Hmm, I was under the understanding that it actually cancels out the pressure by creating a wave exactly 90 degrees off from the initial wave, creating reverse pressure and canceling the sound….
Not sure?