Acoustical Filtered Earplugz

 

These specialized patented filters are inserted into a custom mold to allow safe sounds, those below 80dB like normal conversation, to pass virtually unattenuated. Yet for sounds higher then 80dB, these filters act like mini-restrictors and limit the sound attenuation to OSHA regulated requirements. Best used for industrial noise and shotgun sports where individuals want to hear some conversation or auditory signals coming from machinery.

Filtered earplugs are beneficial when individuals want to have the ability to hear their outside sounds, but still maintain a safe level of protection.  They can be used in several industrial, as well as, recreational activities to take the edge off harmful noise levels.

The following diagram demonstrates how the "ER" filters work.