I inherited some ER4Ps about a month ago that were in just terrible shape. (My uncle's sweat was apparently severely corrosive and had caused multiple points of failure and severe oxidation in the cable, but the drivers were intact. I initially patched things up with a bit of solder and hot...

As we've heard, the iPhone (particularly the 3GS) demonstrates pretty good sound quality. It drives my Etymotics ER-4P very nicely (much nicer than my HK stereo amp which for some reason has a very high noise floor on these phones, though not on my HD595s.) I was wondering whether there is...