This study answers the theoretical question of which aspect/characteristic of a hearing protector has the most influence on a talker’s voice level. It also provides some practical information for hearing protector users regarding wearing techniques that potentially could provide some benefit in terms of better speech communication in noise. The author suggested that the results of this study may be used to begin an effort to quantify metrics for other aspects of a hearing protector’s practical usability/wearability.
Byrne, David C. (2013). Influence of ear canal occlusion and air-conduction feedback on speech production in noise. Online at http://d-scholarship.pitt.edu/20066/1/ByrneDC_ETD_2013.pdf