I recently purchased some Apple In-Ear Headphones off of eBay for $50 off the list price, and the sound quality is good, but only with these crazy equalizer settings above (in my opinion) - else the bass doesn’t have any force to it and the treble is hardly noticeable. Sadly, there’s no way to directly change equalizer settings on the iPhone/iPod Touch apart from the presets, and the closest to these settings (Rock I think) doesn’t make nearly this drastic an adjustment.
It turns out, however, that the iPhone OS will override those settings if an EQ settings is hard-coded into the songs within iTunes. To do this, save your EQ settings in iTunes as a preset, then select all the songs you upload to iTunes, edit the info, and change the EQ settings in the info. It’ll take a while, which is a pain in the ass, but when you sync the music you’ll have the awesome sound you want on your device.
Now, if you’re like me, you use actual speakers on your desktop, which have entirely too much bass to begin with. So, once you’ve finished syncing your iPhone/iPod Touch, you’ll have to remove the settings the same way you enabled them, because iTunes overrides the program settings as well and you don’t want those headphone settings.
After entirely too much effort for so simple a task, you get the best audio you can get on all your devices. If anyone at Apple is listening, a built-in graphic equalizer for iPhone OS 4.0 would be wonderful! (Or at least an API call that lets a third-party program do it for you, I really don’t care either way.)