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Figure 1: Overview of the Sonomax Self-Fit™ earplug: practical diagram (reproduced and modified with the authorization of Voix and Laville[24]) and exploded view (reproduced with the authorization of Sonomax). When using such an earplug, sound can travel to the middle ear along two paths: a solid path which corresponds to the sound going through the HPD material itself and an air path which corresponds to the sound going through the filter

Figure 1: Overview of the Sonomax Self-Fit™ earplug: practical diagram (reproduced and modified with the authorization of Voix and Laville<sup>[24]</sup>) and exploded view (reproduced with the authorization of Sonomax). When using such an earplug, sound can travel to the middle ear along two paths: a solid path which corresponds to the sound going through the HPD material itself and an air path which corresponds to the sound going through the filter