High impedance headphone: requires more voltage but less current
Low impedance headphone: requires less voltage but more current
Amplfier output impedance: the lower the better for any impedance headphone
higher efficiency (for example: 102 dB/1 mW) less power required
​lower efficiency: (for example: 91 dB/mW) more power required

600 Ohm Version - Designed for High-End Audio Applications

This is the 600 ohm version of the DT 880 PRO 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 880 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

250 Ohm Version - Designed for Home Stereo and Relaxed Listening

This is the 250 ohm version of the DT 880 Premium line, designed explicitly for use with dedicated stereo equipment such as home theater systems 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 250-ohm DT 880 is ideal for use in home stereo applications, where clarity and dynamic response are paramount, as well as for use with high-performance home theater equipment and headphone amplifiers.

32 Ohm Version - Designed for Mobile High-Performance Listening

This is the 32 ohm version of the DT 880 Premium line, designed explicitly to provide quality audio from low-powered sources such as portable music players and laptops. Its semi-open design and highly-efficient drivers allow for increased volume with reduced noise leakage while listening to low-output audio players. A lower-impedance headphone such as the 32-ohm DT 880 is ideal for use when you're on the move but don't want to sacrifice having an immersive audio experience.