This i have not done since i went to an ent doc and they didnt give me my results but she said i had near real good hearing. So my question is i was on youtube and checked what frequencies i could hear it started at like 40 and went up to 19000 and as soon as like 15000 came on i had to turn the volume almost all the way up on my iphone to hear.. And same up to 19000 but could hear it a lil with it all the way up. Is there like a volume preference that it should be at when listening or does it not matter how loud you have to turn it up to hear it?