Lets review new studio monitor headphones KRK KNS 6400. They have closed-back architecture and their 40 mm membranes are powered by neodymium magnets. They can absorb outer sounds with 26 dB max volume. They can reproduce sounds in 10 – 22000 Hz frequencies range, their sensitivity is 95 dB, impedance is 36 Ohms and maximal power input is 1000 mW. Headphones are equipped with 2.5 m pluggable cable with 3.5 mm ( 1/8″ ) gold-plated mini-jack connector, it has no built-in volume control unit. Wing and earcups are made of plastic, cushions from leatherette; which provide comfortable long-time use in studio conditions. Head and ears cushions can be replaced in case of damage. Headphones weight 210 g. Package contains : KRK KNS 6400 headphones themselves, pluggable cable, screw-on 6.3 mm ( 1/4″ ) jack converter, storage and carrying case and user’s guide. These are good studio-level quality headphones for optimal price, which can be used for professional work and for in-home use for music listening.