2013/12/22 Raymond Yau <superquad.vortex2 at gmail.com>: > Refer to > http://cgit.freedesktop.org/pulseaudio/pulseaudio/plain/src/tests/volume-test.c > > why 200% is equal to 18.06 dB ? > > 160% / 12.25 dB > 120% / 4.75 dB Looks like the "cubic mapping" thingy, see http://lists.freedesktop.org/archives/pulseaudio-discuss/2012-August/014570.html 160% -> raise to the third power, get 4.096, and convert that to dB (i.e. 20 * log10(x)). Get 12.25 dB. -- Alexander E. Patrakov
