Etymotic offers the hf2, a high-fidelity earphones that is compatible with iPhone. It features 20Hz-16kHz frequency response, 35- 42 dB noise isolation, 16Ohms Impedance and a maximum output of 120 dB SPL. It can deliver high fidelity sound.
The Etymotic hf2 has a 2.5mm stereo plug. It is priced at $179 a pair.