The field will work on you, as long as you can consciously perceive it, when you don’t have headphones on.
Volume only matters if you want to increase the radius of the fields effect. From SammyG himself:
Amplifying fields is only helpful for something like if you have a party in your house and want to fill your house with unconditional love energy or want to clear out entities from a whole neighborhood.
- Source
Usual radius of the fields is:
five feet