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Denon AH-C751 sound-isolating earphones review: Denon AH-C751 sound-isolating earphones

The Good Terrific sound quality; booming bass; good accessories; decent price.

The Bad Heavy; not suitable for use at the gym; quite large.

The Bottom Line An outstanding set of earphones with ridiculously good bass, mids and treble. At this price point, there are few contenders. Don't consider them a choice for your workouts, but for seriously impressive sound quality without being full-sized headphones, the AH-C751s are practically unrivalled

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8.3 Overall

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Whether you're upgrading the earphones that came with your MP3 player, or upgrading the £60 'phones you invested in initially, Denon's £150 AH-C751s could be a stonking entry into high-end earphones, if they're anything like their predecessors, the excellent AH-C700s.

As sound-isolating earphones, they aim to passively block out ambient noise around you without the electronics involved in noise-cancelling headphones. But are they worth £150?

Sturdy aluminium enclosures make these a weighty but robust pair of earphones, with decent cabling and a detachable 0.8m extension should you only need a short wire. Every connection is gold plated to ensure you get decent audio performance, and a lovely sturdy carry case is supplied to keep things safe when not in use.

When they are in use, you'll notice the sound isolation -- provided by soft silicon tips on each 'phone -- is fairly good, and a range of differently-sized tips are provided to ensure you get the most comfortable fit.

The importance here is placed on sound quality and, as with the previous C700s, we're pleased to report it's superb. The C751s demonstrated an ability to produce beautiful highs, punchier mids than the C700s, and the same smooth, deep bass we loved so much in their previous incarnation, with a response range of 12-24,000Hz backed by Neodymium magnets.

Tool's complex track Ticks & Leeches from the album Lateralus was the first to show just how capable these earphones are. Danny Carey's drum-only introduction utilises not only interesting usage of the 7/4 time signature, but also an array of beautiful-sounding drums, each resonating with smooth tones and hard-hitting mids. When the double bass drums kick in, nothing is taken away from this sound; only pounding bass is introduced, along with notably bright cymbals and that crunchy distorted guitar track.

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