If the impedance, power out to the headphones. and the entered headphone sensitivity value are correct, it should be accurate. It’s just math once you have those figures. I’ve got a spreadsheet that does the same thing.
Ive done the cardboard/meter thing with my hd6xx and it tracks what the calculations say. So now I just treat to the voltage output from my qudelix 5k as the actual volume level.
If the impedance, power out to the headphones. and the entered headphone sensitivity value are correct, it should be accurate. It’s just math once you have those figures. I’ve got a spreadsheet that does the same thing.
You can also pretty easily measure headphones with a $20 decibelmeter and a bit of cardboard, see oratory’s explanations in the comments here https://www.reddit.com/r/headphones/comments/humrj8/headphones_earphones_damaging_my_hearing/
Ive done the cardboard/meter thing with my hd6xx and it tracks what the calculations say. So now I just treat to the voltage output from my qudelix 5k as the actual volume level.