CX 300-II Precision Black full review

Sennheiser has a deserved reputation for making consistently great professional and hi-fi headphones. And it has met the portable player challenge with a wide range of earphones suitable for on-the-road listening.

The Sennheiser CX 300-II falls into the category of in-ear headphone, although not in the old sense of sitting loosely in the outer ear, but nor are they the newer entirely-in-the-ear variety, such as those pioneered by Etymotic Research. Instead they provide a comfortable fit with the aid of soft silicone rubber, with three different removable rubber buds included to suit different ear sizes.

Whereas the true in-the-ear designs can provide near-total exclusion from ambient sounds, these looser fitting types give a good degree of isolation without entirely shutting you off from the outside world. They are also more comfortable to wear, especially for those squeamish about inserting an earphone deep inside the external auditory canal.

Importantly for considerate commuters, these semi-excluding in-ear phones can be played at a reasonable volume on a quiet train, for example, without disturbing your neighbours – yet still allow you to hear the sound of traffic as you cross the road.

In appearance, the CX 300-II look nearly identical to the iPhone-centric Sennheiser MM 50, but without the latter’s in-line microphone feature. And the sound quality is broadly similar – clear and incisive, well-damped bass and good upper treble extension.

Listen closely, though, and you’ll find a mildly more refined sounding pair of earphones in the CX 300-II. While the MM 50 has good frequency coverage with punchy bass and a relatively unmuddled midband, the CX 300-II proved to be even more open in the mid. The CX 300-IIs can have a better separation of musical lines too and are slightly less sterile overall.

And strangely, despite the quoted specifications, the Sennheiser CX 300-II headphones sounded less sensitive on our test iPod. Sennheiser lists the MM 50 iPhone headphones with a characteristic sound pressure level (SPL) of 106dB, and the CX 300-II with 113dB – a huge difference in subjective terms – yet we found the mic-less Sennheiser CX 300-II earphones somewhat less ‘loud’, and warranted a nudge on the volume control so that we could enjoy all they could give.

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