Posts like the above make me curious that they don't mention using the built-in bass and treble adjustments to offset any perceived imbalances in the tonal spectrum. Does the bass control effect more the mid-bass or the lower-bass? And same with the treble control; it is just the upper treble that is effected or more high-mid and up?
There was a graph somewhere in this thread posted earlier.
Bass affects more of lower bass but eats into mid bass as well.
Whether this is a good thing depends on ur IEM's bass response frequency.