Acoustic Authority iRhythms A-9900 Sound Cancelling Headphones Review - Acoustic Authority iRhythms A-9900 Review


The headphones are really quite comfortable to wear, as they have some soft pads made from the same material and colour as the carry case. These actually block out a significant amount of noise by themselves.

Also on the right hand ear piece, is a switch to turn on (and naturally off) the noise cancelling aspect of the headphones. This made it very easy to work out if they were doing their job.

The A-9900 headphones are very good at getting rid of consistent noises. For instance, the whining from my computer was cut out completely. Standing underneath our rather rackety air conditioning unit also showed a huge difference. Sudden noises such as typing and conversations weren’t as easily cut out. However, when on the move they really shone where most of the background rumble of a tube ride was cut out. Once again though, the clicks and clacks did come through. We were equally impressed when used in an aeroplane, which is obviously Acoustic Authority’s target market.

With the noise cancelling enabled the sound quality was most impressive and didn’t sound muffled like it did with the Creative headphones. Bass response was excellent and the sound really enveloped me. Listening to Goldfrapp on these headphones was an experience to remember. With the bass boosted on my Sony Network Walkman E-507, it actually made the headphones shake on my head! Naturally, there are better sounding headphones out there, but all things considered we were impressed.


These headphones are superb. The noise cancelling is good enough that ATI would do well to bundle them along with its latest graphics card. Sound quality is the best we’ve seen in this price range for sound cancelling. At an estimated £39.99 on the street it’s hard to fault them.

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