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Figure 5. Insertion Loss obtained by the WILLSON SB 258 earmuff for different peak pressure levels of the impulses: 150 dB, 170 dB and 190 dB (A-duration: 2 ms, normal incidence) (1/3 oct. bands) (the vertical black arrow indicates the unfavourable nonlinearity)

Figure 5. Insertion Loss obtained by the WILLSON SB 258 earmuff for different peak pressure levels of the impulses: 150 dB, 170 dB and 190 dB (A-duration: 2 ms, normal incidence) (1/3 oct. bands) (the vertical black arrow indicates the unfavourable nonlinearity)