The AH-D1100 sets a new standard for performance and value in over-ear headphones. Part of Denon's "Acoustic Luxury" line, the AH-D1100's are premium headphones suitable for the discerning music listener at home, and efficient enough for use "on-the-go" with portable music players. The AHD-1100 employ a newly designed 50mm driver featuring Denon's exclusive Microfiber diaphragm technology. This ultra lightweight radiating surface provides excellent dynamics and extended frequency response (5-37,000Hz) for crystalline clarity. The drivers are housed in precision Aluminum ear cups. To eliminate distortions and colorations caused by conventional sealed-back enclosures, the AHD-1100 also features Denon's Acoustic Optimizer design. This improves low frequency extension and smoothes overall response by precisely adjusting the sound pressure balance behind and in front of the driver diaphragm. The adjustable headband features a new contour fit ergonomic design and is coupled to soft protein leather foam ear-cushions providing comfortable isolation from outside sounds. This, and the unit's light weight (only 180 grams - 6.3 ounces) ensures extended, fatigue-free listening. The AH-D1100 is equipped with an audiophile grade OFC oxygen-free copper cable featuring equal length L/R design. A 3.5 meter extension cable is included along with a 3.5mm to 0.25" adapter and a convenient carrying pouch.