Noise Canceled

When I was in the 'states I got myself a pair of cheap noise canceling headphones. I wasn't expecting them to be up to much, but it turns out that they are quite effective. You turn them on and they do nothing for a few seconds and then there is a kind of un-thump and the sounds outside you vanish. It is a bit like having a wet flannel suddenly wrapped around your head.

I've been wondering what would happen if I played the same music into some speakers and the headphones, sat next to the speaker, and then turned the noise canceling on.......

Comments

[Simon]

My sony mp3 player came with noise cancelling headphones, but it states that they only really cancel out continous background noise such as the humming of an engine or an air conditioning unit, and not the screaming child three seats away. Do yours work better than this?