Using the FONIX 7000 to Verify Coupler and Real-Ear Performance ...

Real Ear Measurements 56
Figure 74 – Insertion gain data providing frequency specific
attenuation data for the earplug. Notice that the greatest
attenuation, approximately 30 dB, is provided around 3000 Hz.
Note…The top display graph in Figure 71, labeled “Insertion Gain,” illustrates the
amount of attenuation provided by the foam earplug across the frequency range. The
numerical data in Figure 74, correspond with that insertion “attenuation” curve (labeled
6) in Figure 71. This measurement may be used to verify the response of a musician
earplug or may be helpful in counseling employees enrolled in hearing conservation
programs as to the proper insertion of hearing protector devices.