IEMs are higher-quality in-ear headphones and are used by audio engineers and musicians as well as audiophiles. This was the MDR-3, developed along with the original Walkman as lightweight, open headphones with driver design, which would set a new standard for all headphones to come.

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Physical limitations of recording media in analog recording limited the use of extremely low sounds, but this no longer applies in digital recording. Because of their size, circumaural headphones can be heavy and there are some sets that weigh over 500 grams (1lb). Some noise cancelling headphones are designed mainly to reduce low-frequency engine and travel noise in aircraft, trains, and automobiles, and are less effective in environments with other types of noise. For information about the external power supply bundled with the product (when applicable), please refer to the link regarding information on ecodesign requirements for external power supplies in accordance with the COMMISSION REGULATION (EU) 2019/1782 of 1 October 2019 laying down ecodesign requirements for external power supplies pursuant to Directive 2009/125/EC of the European Parliament and of the Council and repealing Commission Regulation (EC) No 278/2009

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