Sennheiser CXC 700

Sennheiser CXC 700s are fairly good active cancelers, but with worrying durability concerns.

All in all, the Sennheiser CXC 700s perform about as well as they should.

Active noise cancelling earphones that try for high-end sound and don't quite hit the jackpot.

Mention noise-cancelling headphones and most people think of large, over-ear models like the Bose QC15. Comfy as those big cans can be, they’re waaaay too big to slip into a pocket or purse. But not all noise-cancelling headphones come in cases sized like jumbo donuts at the State Fair. In fact, a few manufacturers have added noise-cancelling technology to their in-ear monitors (IEMs), using a little “lump in the line” to house the needed electronics.One might fairly ask, though: Do IEMs really need noise cancelling? After all, when used with tips that fit your ears properly, IEMs completely seal off your ear canals. However, IEMs do most of their noise-blocking at frequencies above 1 kHz. Below that, they’re not so effective at keeping the noise out.

Mention noise-cancelling headphones and most people think of large, over-ear models like the Bose QC15. Comfy as those big cans can be, they’re waaaay too big to slip into a pocket or purse. But not all noise-cancelling headphones come in cases sized like jumbo donuts at the State Fair. In fact, a few manufacturers have added noise-cancelling technology to their in-ear monitors (IEMs), using a little “lump in the line” to house the needed electronics.One might fairly ask, though: Do IEMs really need noise cancelling? After all, when used with tips that fit your ears properly, IEMs completely seal off your ear canals. However, IEMs do most of their noise-blocking at frequencies above 1 kHz. Below that, they’re not so effective at keeping the noise out.

Mention noise-cancelling headphones and most people think of large, over-ear models like the Bose QC15. Comfy as those big cans can be, they’re waaaay too big to slip into a pocket or purse. But not all noise-cancelling headphones come in cases sized like jumbo donuts at the State Fair. In fact, a few manufacturers have added noise-cancelling technology to their in-ear monitors (IEMs), using a little “lump in the line” to house the needed electronics.One might fairly ask, though: Do IEMs really need noise cancelling? After all, when used with tips that fit your ears properly, IEMs completely seal off your ear canals. However, IEMs do most of their noise-blocking at frequencies above 1 kHz. Below that, they’re not so effective at keeping the noise out.

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The Sennheiser CXC-700 are great-sounding in-ear headphones that have decent, slightly bass-heavy audio reproduction with most tracks. Unfortunately, they perfor...