Half-opened over-ear headphones. The first collaboration semi-open back headphone between the two companies but also based on using beyerdynamic's 600 ohm semi-open back T1 headphone, creating a 32 Ohm output impedance value. Users can experience impressive, spacious sound, detachable cables and luxury grade surface finish with Astell&Kern's portable players. An additional 2,5 mm balanced cable for Astell & Kern portable audio devices is included with a 3,5 mm audiophile grade cable. Just like all of beyerdynamic's headphones, the AK T1p is handmade in Germany with the greatest attention to detail. Includes hard case. Sensitivity: 102 dB (1 mW / 500 Hz). Max. SPL: 300 mW. Weight: 360 g. Colour: Gray.