One HIFIMAN EF6 audio headphone amplifier in a fantastic condition (the original European 230 volts version). Hand-built by HIFIMAN craftsmen, the new EF6 flagship headphone amplifier provides audiophile quality for the most demanding listeners. Fit and finish hint at the amplifier’s exceptional performance under the hood. EF6 is a hi-end headphone amp with very powerful output. EF6 can also work as a world-class pre-amplifier. The EF6 the clear choice for discriminating music lovers seeking a no-compromise headphone amplifier yet priced well below units with comparable performance. Serial number is 13092908. Retail price is 1.999 euro. Check our other listings for more interesting items. Free shipping worldwide!