The Hifiman Edition X high-end headphones are designed for people who like to listen to music through their smartphones, but don't like to compromise on audio quality.
These headphones offer a frequency response between 8 Hz and 50 KHz, and are capable of offering high-fidelity audio without needing to be hooked up to portable headphone amps. They are designed with beveled earpads and contoured straps for extra comfort.
Listening to music on your smartphone has long been unviable for the discerning audiophile, because music played from smartphones never quite matches the quality of music coming from a proper music system. However, the Hifiman Edition X high-end headphones are filling a gap by making high-fidelity music listening possible on smartphones.