The NEW FiiO E12A special edition portable headphone amplifier adopts an upgraded high performance OP AMP combination. Designed around the MUSE02 by muses. The audiophile semiconductor division of New Japan Radio Co. Ltd, achieves unparalleled subjective and objective quality coupled with the LME49600 buffer to achieve <0.0003% distortion and increased S/N ration 115dB. The E12A gives the perfect balance between high performance sound fidelity and long lasting durability. The unit gives you low distortion as well as low internal resistance. The E12A has a built in Li-polymer battery with a large capacity, supplying a strong power supply. +11V comes from the three cascaded batteries, while -11V is the outcome of the high performance DC/DC circuit transformation, which in the end creates a 22V working voltage. And buy this Fiio (Mont Blanc) E12A Portable Headphone Amplifier - IEM SPECIAL EDITION Now £129.00.