The phone manufacturer can only guess how loud it actually is to your ears. Every pair of headphones outputs at a different volume, and more expensive ones tend to be quieter for reasons I forget.
Because expensive headphones tend to have drivers with higher impedance, meaning they produce less volume at the same current versus a lower impedance set.
That’s true for wired headphones, at least. For anything wireless, they have a secondary amplifier not in your phone, so then the phone really really has no idea.
The phone manufacturer can only guess how loud it actually is to your ears. Every pair of headphones outputs at a different volume, and more expensive ones tend to be quieter for reasons I forget.
Because expensive headphones tend to have drivers with higher impedance, meaning they produce less volume at the same current versus a lower impedance set.
That’s true for wired headphones, at least. For anything wireless, they have a secondary amplifier not in your phone, so then the phone really really has no idea.