On another note, if any of you EPH-100 owners happen to have a Cowon, please try the "BBE Viva" setting with your Yamahas. I rarely EQ my IEMs unless it's necessary (*cough* IE8 *cough* ;-), but BBE Viva sounds really nice with the EPH-100. It's essentially a v-shaped setting and you'll loose a little bit of midrange presence and smoothness, but gain better soundstage, bass peak shifts toward deep bass and treble clears up nicely.
Nice finding, sounds really nice with classical and any music in need of a large soundstage, but I still prefer to retain the solid mids for progressive and metal (forward drums/guitar, yumi!) so I let the EQ relatively flat for those (just a little touch up in the treble since I'm still used to the FX700).