If anyone is curious, this is what the sensitivity measurement is on headphones: https://en.wikipedia.org/wiki/Headphones#Sensitivity https://en.wikipedia.org/w

If anyone is curious, this is what the sensitivity measurement is on headphones: https://en.wikipedia.org/wiki/Headphones#Sensitivity https://en.wikipedia.org/wiki/Headphones#Sensitivity TL;DR "The sensitivity of headphones is usually between about 80 and 125 dB/mW and usually measured at 1 kHz." and note that since dB is logarithmic, every 6dB is 2x the energy (human-perceived "doubling of volume" is typically ~10dB; see also: https://en.wikipedia.org/wiki/Fletcher%E2%80%93Munson_curves https://en.wikipedia.org/wiki/Fletcher%E2%80%93Munson_curves )