Here's a very small on-ear headphone you can probably enjoy with no need for bass, treble, or any other adjustments. $19 USD - ridiculously good - say no more....
http://www.hifiheadphones.co.uk/com...on-ear-portable-stereo-headphone-review.4348/
http://www.hifiheadphones.co.uk/com...on-ear-portable-stereo-headphone-review.4348/