Speaker Frequency Issue

[Shannon]

The ultrasonics can damage hearing if played to loud

But i wont wear earphones and earphones reduce noise. I will listen to it from outside.

Edit: My question is what happens when there is a crackling sound or static because of the high volume does it make subs useless?

It does not really make much sense to play them through headphones you are not wearing.

That aside, if you have speaker distortion, you're not going to get clear subliminal audio at the same time.