[LAU] Calculating absolute played(!) volume

Hey hey, for a project I am wondering, if the absolute output volume of a pair of headphones, directly connected to a soundcard, can be gained from the settings? I have a Delta 1010. Inside alsamixer the volume for the DACs is set in dB. Is there a straight relationship between these settings and a connected output device? My pair of headphones, IIRC, have a resistence of 60 Ohm. Any help is appreciated. A good pointer will do. If there is a method without special measuring equipment, I'd be happy. If not... So be it. Best wishes, Jeanette -- * Website: http://juliencoder.de - for summer is a state of sound * Youtube: https://www.youtube.com/channel/UCMS4rfGrTwz8W7jhC1Jnv7g * Audiobombs: https://www.audiobombs.com/users/jeanette_c * GitHub: https://github.com/jeanette-c But now I'm stronger than yesterday <3 (Britney Spears)