NYT article summarized:
– Wirecutter, a product review site, reviewed 30 pairs of kids’ headphones which promise to limit volumes to safe levels.
– Half of the 30 did not restrict volumes to safe levels as promised.
– The decibel scale does not have a linear relationship. 80 db is twice as loud as 70 db and 90 db is four times as loud.
– 100 db (like a power lawn mower) is safe for 15 min. 108 db is safe for less than three minutes.
– There is no regulation or standard for sound levels in headphones.
– Bottom line, for kids, if they can’t hear you with the headphones on it’s likely an unsafe volume.