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You can use foobar+rockbox to calibrate your EQ for your headphones. In foobar, you can use the following to generate a 400Hz 10 second test tone:tone://400,10Copy that to your clip board, goto edit, and chose "insert track". Chose a few frequencies corresponding to the EQ bands you want to adjust in Rockbox. You can only change 5 at a time, so this shouldn't be hard. Then use the file converter to make it into a wav/flac/whatever file and load into rockbox. You may want to replaygain them in foobar first, since I think foobar gives them all equal energy, not perceived loudness! Once in, play them while adjusting the Rockbox EQ. You should set the EQ so that they sound about the same volume, that way Rockbox will produce an accurate sounding copy of your music.Once you've done that, you may want to tweak them a little more to taste, but thats a personal call.
There also is a thread at Misticriver in which people posted their EQ settings, for copying to your player. http://misticriver.net/showthread.php?t=36635Included are some Shure EQs, including for the E2C. Of course, it all depends on your personal preference (I tend to keep things flat), but it's a way to start/experiment.
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