AM6 25% over maximum?

[Determined]

Hi Babans,
Just had a look as I was confused. It means 25% of the maximum volume. Not 25% over that, but that's just on headphones.. speakers are fine.

It's also why we usually don't recommend using headphones with ultrasonic, it's better with the masked versions.

I predominantly use headphones with ultra sonic while I sleep to get my sub hours in, are you saying this would be less effective than over speakers?