Sennheiser MM 400-X review

Best wireless headphones, Awards 2012. A must-audition for owners of aptX-enabled phones and laptops Tested at £180

What Hi-Fi? Verdict

Best wireless headphones, Awards 2012. A must-audition for owners of aptX enabled phones and laptops


  • +

    Very compact, portable design

  • +

    tonnes of multimedia-friendly features

  • +

    aptX for the best Bluetooth audio quality


  • -

    Wired headphones still sound a bit better

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We love Bluetooth when it’s of the aptX variety, and thankfully the audio-friendly tech is finally starting to hit more and more devices.

In fact, you may well already own one with it built in, such as a MacBook running OS X 10.6.4 or later, or the new HTC One X or Samsung Galaxy S3 smartphone. If you’ve got one of those you should really take advantage by adding a pair of these aptX-toting Sennheiser MM 400-X headphones.

Like the Sennheiser PXC 310 BT before it, this Bluetooth headset boasts a very compact, lightweight and foldable design, a set of controls on the right-hand cup for navigating your music, and the option of connecting a cable for going wired when you’re on a plane or when the 10-hour battery runs out.

There’s even a built-in mic for smartphone users. In fact, the only thing missing is noise-cancelling, which is available if you stretch to the MM 450-X version.

Most importantly, these high-tech headphones sound great. They’re not the deepest deliverers of bass, but they’ve got plenty of detail and directness, especially in the vocals.

True, they’re not quite up to the standard of wired headphones at the same money, but if you want the convenience of Bluetooth in a very portable and sonically capable headset, you really can’t go wrong with these Sennheisers.

MORE: Best wireless headphones 2014

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What Hi-Fi?

What Hi-Fi?, founded in 1976, is the world's leading independent guide to buying and owning hi-fi and home entertainment products. Our comprehensive tests help you buy the very best for your money, with our advice sections giving you step-by-step information on how to get even more from your music and movies. Everything is tested by our dedicated team of in-house reviewers in our custom-built test rooms in London, Reading and Bath. Our coveted five-star rating and Awards are recognised all over the world as the ultimate seal of approval, so you can buy with absolute confidence.

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