on 17 November 2013
They certainly reduce sound but not a sound block. However when listening to music you really hear the music as the background hum from a train or cafe seems to disappear, so you have a real quality listening experience. But if you want to use them to block out sound to sleep, it is only partially effective. I have tried all the cheap noise cancelling phones over the years from JVC, Sony, all the ones for under £100 and they were really bad compared to this. Well worth the investment without breaking the bank balance. Happy with the purchase.