He wrote more about it and covered heat at http://runawaybrainz.blogspot.co.uk/2012/04/audio-crystal-cmoy-freeform-headphone.html http://runawaybrainz.blogspot.

He wrote more about it and covered heat at http://runawaybrainz.blogspot.co.uk/2012/04/audio-crystal-cmoy-freeform-headphone.html http://runawaybrainz.blogspot.co.uk/2012/04/audio-crystal-cm... Seriously nice work. Tempted to build something similar myself.