I get these as a father 's day gift and be blow away by they . not only do they block outside sound even at low level better than some noice cancel headphone I have try -lrb- at 3 time the price -rrb- the sound quality be really amazing . use lossless audio -lrb- flac -rrb- I can hear every nuance of music I have never hear before . it be like listen to music I have be listen to for year for the first time . highly recommend .