Scanspeak D3004/604000 Beryllium Tweeter - Illuminator Range - Willys-Hifi Ltd
TAD PIONEER BERYLLIUM RIBBON TWEETER DRIVERS Photo #468409 - US Audio Mart
FOCAL TWEETER TECHNOLOGY - Focal Australia
Archimago's Musings: Paradigm Signature S8 v.3 Tweeter Replacement. A word about importance of speakers (+ rooms). (And a link to a HDMI cable blind test.)