I just got the chatterbox for my wife and me. They have dynamic noise reduction mics. As an intercom they are damned fine. At a little above half volume the bass freq. drops off a little but still quite good considering all the other other noise going on in an open-face helmet.Ted in ncal said:On the old board there were postings regarding noise cancelling mikes. Would like to try one if they work. Can anyone provide a link to a source?