Yes, you can. And I do. But I always wonder how those frequencies affect the speakers. So maybe a good idea not to turn it superloud. Pretty much impossible to replace iPhone or iPad speakers.
But yes, the subs work perfectly through smartphone speakers. Use FrequenSee or some other wave analyzer to calibrate the decibel level.
That’s interesting. There’s quite a variety of subjective reactions to the tracks. Depends on the person, I guess. I seem to find the masked tracks (with the sounds) pretty soothing. I listen at night and it relaxes me and occupies my attention which helps me to sleep. Others find their sleep disturbed.
There’s an app called AudioShare which you may find convenient. You can transfer tracks to it from your music library. Then you can play the track in AudioShare in the background while you play something else in YouTube or any other app. This allows you to listen to other things on your phone while simultaneously playing the subliminal. Just BE VERY VERY CAREFUL about playing ultrasonics that way. You could have the volume all the way up and not realize it, very dangerous for your ears.
Fortunately you can set the volume in AudioShare independently. Unfortunately, you can’t make a playlist with several tracks played one after another. But you can set it to repeat one individual track over and over again. Pretty cool little thing.