Just an update.

Just as an experiment, I plugged in my headphones that came with an older portable CD player I used to have.

I played a Shoutcast radio station, and the headphones were so loud, just like my iPhone gets with the headphones.

Anyone near the headphones at Max volume would complain about having to hear your music.

I guess the headphones really do matter.

I still can't go too loud, I'm not one of those people who can hear extremely loud music. When most people say listen to this song, I have to hold them like a foot away from my ear.