The K 172 AKG headphones feature the famous AKG Varimotion diaphragm technology. The AKG Varimotion diaphragm in the design enables the diaphragm perimeter of the headphones to vibrate elastically while the centre pumps like a piston, thus achieving better sound quality. Physically the AKG K172 HD are closed-back headphones that have been made with the listener’s comfort in mind. The K172 AKGs have a self adjusting headb&, as well as snugly fitting on-ear design that makes painful, pinching earpieces a thing of the past. These high definition AKH headphones lend themselves well to single ear use for DJs, as well as producing loud & rugged sound, that is ideal for professionals. AKG have been producing equipment for broadcasters & other professionals for over 60 years, & the K172 promise to be an equally popular choice for professionals going forward. AKG have earned themselves a reputation for excellence, producing equipment that delivers outstanding sound, & the K172 headphone are no exception to the AKG rule. – You will be impressed with this AKG model, especially if you are ideally looking for headphones that do not leak sound, & that will deliver supreme quality sound, even when being used in loud noisy conditions. These high definition headphones achieve a dynastic range that is more than admirable. The K172 AKGs are well suited to use in mobile environments, which makes them versatile & practical for people who need to be mobile. Another attribute of these AKGs is the 99.99% oxygen free cable that ensures a pure sound transmission! Headphones weight without cable (g) 200 Sensitivity (d B/m W, d B/V*) 94, 107 Audio bandwidth (Hz to k Hz) 18-26 Max. input power (m W) 200 Rated impedance (ohms) 55 Convertible jack plug (1/8" to 1/4") Yes Replaceable ear pads Yes Patented self-adjusting headband Yes Unbreakable metal arches Yes 99.99% oxygen-free cable (length in m) 3 Single-sided cable Yes Hard gold-plated jack plug & contacts Yes Patented Varimotion diaphragms Yes Closed-back, dynamic headphones Yes Nd Fe magnets Yes Suited for (SA)CD, DVD (A), DAT Yes Best for MP3, CD, MD & PC/laptops Yes