Beyerdynamic DT 990 Edition vs Sennheiser HD 660 S

Devices with stereo speakers deliver sound from independent channels on both left and right sides, creating a richer sound and a better experience.

Comfortable full-size form with earcups that fully enclose your ears. This model is loved for its increased sound isolation and the fact that it won't leak sound to your neighbors. It offers potential for maximum bass and loudness levels.

With a detachable cable you can use alternative cables, and if the cable is pulled it will pop out instead of breaking.

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Foldable devices are easier to transport and take up less storage space.

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The cable is designed to minimize tangling.

The highest frequency at which device produces audio. The higher the high-frequency response, the clearer and crispier the treble.

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The lowest frequency at which the device produces audio. The lower the low-frequency response, the stronger and juicier the bass.

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Devices with a higher sound pressure level are generally louder when supplied with any given audio source.

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Impedance is the device’s electrical resistance to the current being pushed through it. The lower the impedance, the easier it is to get higher volume and requires less power.

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Devices with neodymium magnets are lighter and more powerful than those which use ferrite magnets. They also have more bass and clear high notes.

Wireless devices allow users more freedom of movement.

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A standard 3.5mm male connector is suitable for use with all MP3 players and computer sound cards.