Well, most adults can't even hear much below 30Hz, especially below 25Hz.
We can feel the vibrations from the sound waves below 20Hz.
But vibrations from sound waves at 30-60Hz have a lot more ENERGY/FORCE than sound waves at 10-20Hz.
I think
@TLS Guy talked about this before, but I think he might have said 40-80Hz.
@PENG can also discuss the Engineering/Physics aspects of the Force/Energy from the sound waves of different frequencies.