The closed-back EL-8 offers all the benefits of the open-back EL-8 - flexible, lightweight and loaded with new technology - while isolating the listener and reducing ambient noise as no sound escapes the earcups. The EL-8 closed-back is also sensitive enough to be driven directly by portable players and smartphones, but an external amplifier produces better results. They're built with superb craftsmanship, wood veneer accents and enormous attention to detail. Pushing sound technology to the limits, the EL-8 is designed with the world's most advanced planar magnetic technology including Fazor elements, revolutionary Fluxor magnetic structure and Uniforce diaphragm design. The result is sound quality unheard of in this or any other price category. It's flexible and portable, a statement of exclusive elegance inside and out. The EL-8 works beautifully with smartphones, tablets and portable players. You can dramatically improve the sound using an external headphone amp or the Audeze Deckard DAC/Headphone Amplifier. Enjoy total musical satisfaction on the road or at your desktop, the best of both worlds.