Exactly. When I went on holiday to France, I brought my PSP, old Sony Walkman CD player, and two sets of earphones (the ones that come with my Walkman and the ones that came with my PSP). My brother was using my Walkman earphones on my PSP (watching Monty Python) so I listened to some music on my Walkman with the PSP earphones. It was so quiet, I couldn't hear Linkin Park at full blast, with all the hustle of the train station around me! I had to press the earphones against my ear for me to be able to hear at all!

__________________