Listening to the HFI-2200 ULE will make you think you are sitting in the sweet spot of your own personal concert hall. These open, dynamic headphones use a 40mm gold driver that provides a rich, warm sound with extremely lifelike ambience. And with a detachable cable and soft velour earpads these headphones will envelop you in majesty. S-Logic¿ Natural Surround Sound: S-logic¿ uses decentralized driver positioning to utilize the pinna of the ear in the manner it is used in everyday life, reflecting the audio signal off the surface of the outer ear in different directions before entering the auditory canal. This results in a very natural spacious three-dimensional sound. S-Logic¿ is the only headphone system which includes your entire sense of hearing. Safer Listening: Because the S-Logic¿ technology does not aim the auditory signal directly down the ear canal but at the pinna, pressure to the ear drum is decreased by up to 40% (3-4dB) for the same perceived loudness. This significantly reduces the risk of hearing damage and ear fatigue ¿ an absolute must if you spend a lot of time in headphones. ULE technology: The ULE technology was systematically developed by ULTRASONE for users who spend many hours in the headphones. All headphone drivers produce low-frequency magnetic fields. In response, ULTRASONE developed a special MU Metal shielding (ULE technology) to reduce the radiation by up to 98% compared to ordinary headphones. Technical Specifications:Open headphone,S-Logic¿ Surround Sound,Frequency range 10Hz to 25kHz,Impedance 75 Ohm,Sound pressure level 94 dB,Driver 40 mm gold-plated,MU metal bufferboard in accordance with ULE standard,Cable length: Detachable 3m (approx. 9'),6.3mm (1/4) plug with 3.5mm (1/8th) adapter,Weight 292g,Carry bag and demo CD included, 2yr warrantee, www.ultrasoneusa.com.