The Focal and Naim app on my phone for the Focal Bathys comes with a pretty extensive hearing test and boosts the levels in the areas which you are least able to hear.

It asks you to click and hold a button when you hear the sound.

By doing so they can figure out what point your hearing loss and cutoff is.

The adjusted personal profile for my own hearing in my phone and now in the headphones across all devices is amazing.