Comment on What is the absolute max level of ear protection you can get?
explore_broaden@midwest.social 4 weeks agoActive noise cancelling does reduce the actual sound pressure (that’s the only way volume can be reduced). See for example: en.wikipedia.org/wiki/Hearing_protection_device#E….
FuglyDuck@lemmy.world 4 weeks ago
You understand that all of those devices have passive noise isolation, right?
What the electronics are doing is actually playing back noises that don’t cross certain thresholds. (Like people talking.) so you can “hear” them, but really it’s the speaker drivers you hear. The best will also filter out background noise, but the protection comes from the passive protection.
(Which is again different from acoustic filters, which basically create a chamber that alters the noise wave forms to passively attenuate things that are too loud.)