User:Samuelpenni/Earplug

 Under Hearing protection 

Hearing protection can also be verified using real-ear methods. Real-ear attentuation at threshold (REAT) measurements test how narrowband noises of varying center frequencies are attenuated with and without hearing protection in place. The difference in thresholds with and without the hearing protection in place determines the amount of attenuation.

 Under Custom Mold 

Hearing protection should also be verified using real-ear methods to ensure proper attenuation. Real-ear attentuation at threshold (REAT) measurements test how narrowband noises of varying center frequency are attenuated with and without the custom mold in place. Testing for low-frequency attenuation can help to verify the earmold fit while testing high-frequency attenuation can verify the properties of the filter used.

...It is also important that during the impression process that a music performer use their embouchure or move the jaw to mimic singing in order to account for ear canal changes during performance. Therefore, if the impression is not properly constructed, then it will need to be redone. ...

 Under Noise Reduction Rating (NRR) 

Real-ear attenuation at threshold (REAT) measurements are performed multiple times with 10 to 20 subjects to determine the NRR. Using the collected data, an average group attentuation is reported along with a standard deviation for attenuation on the hearing protector package.