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Sennheiser CX 500 sound-isolating earphones review: Sennheiser CX 500 sound-isolating earphones

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The Good Overall sound quality; powerful bass; well designed; decent sound isolation; different sized tips supplied.

The Bad Average high-end performance; no detachable audio cable.

The Bottom Line An excellent pair of sound-isolating earphones and one of the best choices to upgrade to from the cheap bundled models that come with most MP3 players. Although not perfect, they offer good overall sound and powerful bass

8.3 Overall

If you've decided to upgrade the bog-standard earphones that came with your MP3 player, you've made the right decision. You would be forgiven for thinking that a decent and expensive player would come with decent and expensive earphones, but they don't. In fact, they're probably worth under a tenner.

Sennheiser's CX 500s are sound-isolating earphones that retail for under £50 and, as such, should be seen as a very attractive purchase -- some earphones can cost up to £400. But for about £45, are these really worth more than the free gear you got with an iPod?

Sound isolation passively blocks out external noise, meaning you can keep volume a little lower and save some ear strain. Like most isolating earphones, the CX 500s use silicon tips. They're extremely comfortable and Sennheiser provides various sizes to ensure you get the snuggest fit. With the correct tip, these 'phones seal sound in nicely and go practically unnoticed with their light weight.

Also, thanks to their small enclosures, the 500s are unintrusive and as the top model in their range, the cable has an in-line volume control -- a big plus for joggers and gym-goers. It's part of a generally very good bit of cabling; wires are reinforced at every pressure point to avoid damage to the internal wiring.

Sennheiser's CX 300s are popular upgrade choices for MP3 player owners, and with a good design, decent sound quality and an excellent price, it's not hard to see why. But the CX 500s build on that and do so with gusto. Design and fit aside, the big advantage here is significantly better sound quality.

The most prominent element of the 500s' sound is their bass performance -- bass lines and overly-compressed drums on Paramore's poptastic track 'Decoy' rumbled and chugged along with strength and without ever really interfering with the mids, although -- as we'll come to shortly -- they didn't compliment the high end.

The mid-range is good, too -- as they should be, mids are hard-hitting and punchy. Snare drums cracked into our temples and guitars were driven with power, all the time backed up by strong bass.

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