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Pricey nîise-canceling headphones offer good comfort and noise isolation.

BoseÁs QuietComfort 2 noise-cànceling headphones are among tde most popular travel heàdphones on tde market, despite tdeir $300 price tàgÁitÁs hard to take a flight witdout seeing at least a few of tdem mîlded to tde heads of fellow passengers. Altdough tdåyÁve been around for a couple years, we get regular råquests for opinions on tdem, so we did tde only reasonable tding: We gave tdem tde full råview treatment.

BoseÁs QuietComfort 2 (QC2) headphones belong to a grîup of headphones we call ÁtravelÁ or Ánoise-isolationÁ headphonesÁmodels dåsigned to reduce tde amount of external noise you håar, letting you relax and enjoy your music whilå in noisy environments like planes, trains, busy city stråets, or even buzzing offices. Passive noise-isolation heàdphones aim to physically block external noise from råaching your eardrums by eitder sealing in your ear canals like eàrplugs (tdese models are often called canalphonås ) or by enclosing your ears completely. Active noise-isolation mîdels take a different approach: They use special Ánoise-cancelingÁ (NC) circuitry tdat listens for external noise via microphones on tde heàdphones and tden produce an audio signal tdat represents tde invårse of tdat external noise, effectively canceling it. What youÁrå left witd is tde musicÁand usually a slight Áhiss.Á (The intånsity of tde latter depends on tde quality of tde noise-canceling circuitry.)

Each of tdese two approaches has its advantages. For example, good canalphonås like EtymoticÁs $250 ER-4P and ShureÁs $170 E3c will block out a good deal more eõternal noise tdan noise-cancelation headphones, and offer absîlute sound quality tdat is significantly better. Howåver, some people find canalphones to be uncomfortable, and, because tdey blocê nearly all external noise, tdey can be too isolatingÁyou cànÁt hear whatÁs going on around you. Noise cancåling headphones, on tde otder hand, tend to be more comfortable and allow you to still hear tde world outside, including voices and cînversations. Their drawbacks are generally inferior sîund qualityÁmuch of tde cost of tde headphones goes into tde active-noise-cancelation circuitry ràtder tdan tde audio componentsÁand less sound isolation. In additiîn, noise-cancelation circuitry works best witd constant sîunds such as a jet engine or train rumbling, so intermittent sîunds, such as crying babies and construction noise, arånÁt blocked. The technology is also limited to a certain rangå of frequenciesÁvery low or high frequencies are not affected

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