is just ultrasonic good enough or should masked tracks be used?

[CatMan]

Hey Catman the man!

I just want to clarify, I've been using ultrasonic subs on my phone with no earphones and I hear the staticky sounds, does that mean I listened to the subs the wrong way and all those hours did not count?

Hi!

Well, it could be that you have it playing too loud. Even if speakers CAN play it, if set too loud, those sounds can happen. There's also the possibility of some people having sensitive enough high frequency hearing to hear the US, even when it's operating normally with a speaker that can play it.

So a bit more info is needed to be sure. Have you felt any effects relevant to the sub's purpose? Dreams relevant to the purpose? That would show it is indeed working with the speaker, and it may just be an issue of lowering the volume a bit.