Audio-Technica ATH-AD900X vs Koss PRO4AAT

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

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.

The device comes with its own special case or pouch, which is useful for safe transportation.

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

A long cable ensures more freedom of movement.

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A coil cable offers more flexibility, as it can be further extended when in use, as well as retracted to take up less space when not in use.

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

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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. Show more

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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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The device sits tightly in place, creating an acoustic seal which reduces background noise and prevents your music from leaking out.

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. Show more

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