The Best of Both Worlds Combines the advantages of closed-back headphones (no sound leakage for a truly private experience) with the open sound of open-backs (typical "speakers" sound) - making it ideal for both home and street use. Outstanding Sound The 50mm (2") driver, the biggest driver in the AKG headphone range,delivers a realistic soundstage - far beyond what other headphones typically deliver. Cozy Fit With large ear cups and a new, lightweight headband design, the K550 offers an amazing, comfortable fit allowing for hours of continuous listening.
Frequency response: 12Hz ~ 28KHz
Sensitivity: 114dB SPL / V
Input Power: 200mW
Cable length: 3m