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Figure 4. Insertion Loss afforded by the RACAL Airsoft earplug for different peak pressure levels of the impulses 150 dB, 170 dB and 190 dB (A-duration: 2 ms, normal incidence) REAT measured by B.I.A. (quoted by Kusy, 1991) (1/3 oct. bands)

Figure 4. Insertion Loss afforded by the RACAL Airsoft earplug for different peak pressure levels of the impulses 150 dB, 170 dB and 190 dB (A-duration: 2 ms, normal incidence) REAT measured by B.I.A. (quoted by Kusy, 1991) (1/3 oct. bands)