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600 Ohm Version - Designed for High-End Audio Applications The DT 990 Headphones with 600 Ohms proves its power when connected to a hi-fi system at home or with an Amplifier This is the 600 ohm version of the DT 990 Premium line, designed explicitly for high-output usage and headphone amplifiers. Conventional headphones with lower impedance ratings offer higher volumes at the same level of input, but need heavier drivers to compensate for low impedance or risk sounding muddy and distorted. The lower mass of the drivers of a higher-impedance headphone delivers unparalleled clarity and response, but takes more power to achieve the same loudness. So a higher-impedance headphone such as the 600-ohm DT 990 is ideal for use in high-end applications, where clarity and dynamic response are paramount, as well as for use with convenient headphone amplifiers like the beyerdynamic A1. A gold plated 3.5 mm stereo jack with 1/4" inch adapter is included