The Audeze LCD-4z is a low-impedance, high performance planar magnetic reference headphone delivering high-resolution audio performance from 5Hz to 50kHz. The Audeze LCD-4z delivers the high-quality sound of the flagship LCD-4 reference headphones without the need for an external amplifier with an impedance of just 15 Ohms. Furthermore, the LCD-4z boasts a brand new light-weight magnesium housing and carbon-fibre suspensation, resulting in a 25% weight reduction for improved comfort in long mixing or listening sessions. These open-back headphones include Audeze’s Double Flexor Magnetic Array to create powerful open magnetic circuits and allowing the drivers to deliver uncompromised performance. The nano-scale diaphragms employed are able to accurately reproduce super-fast transients and musical detail with virtually no distortion. Audeze LCD-4z Specifications : Magnesium housings 15 Ohm voice coil Flux density 1.5 Tesla. Large ultra-thin nano grade Uniforce diaphragms. Double Fluxor magnetic arrays. Fazor elements. Includes: LCD-4z Headphones in Magnesium and gold grills, 1/4in to dual 4-pin mini-XLR Premium LCD Headphone Cable and professional waterproof travel case.