Recent research on hearing health has revealed that temporary "ringing of the ears" and other short-term symptoms should not be dismissed, suggesting that safe sound exposure levels are lower than previously believed and below current US OSHA standards. This paper reviews contemporary clinical trials and animal studies on sound exposure, comparing findings to sound levels in public theatres, e-sports, gaming, and personal audio platforms, with a focus on protecting young ears. Clinical data is contrasted with hazard-based recommendations from WHO, ITU, and the European Commission. The paper introduces the newly standardized Loudness-to-Dialog-Ratio (LDR) metric and reports on an experiment showing that LDR can effectively manage sound exposure in children's movies. The paper advocates for incorporating LDR as a key quality control metric in content aimed at young or sensitive listeners to preempt potential legislation. Anecdotal evidence from Denmark highlights the real-world impact of high sound levels on young audiences.
Summary of latest clinical findings in hearing safety Summary of global limits and requirements on sound exposure Introduction of new LDR metric to better control sound exposure in childrens' movies LDR applied in QC and delivery specification, including language dubbing