Krypton Launches Electron60 31/2″Transmission Line Bookshelf Speaker Pair Krypton Audio announces the availability of Electron60 31/2″ Full-Range Transmission Line Bookshelf Speaker Pair. The Krypton Electron 60 Audio Electron60 3-1/2″ bookshelf speaker is the smallest in the Krypton Audio “Electron” family, but March 9, 2016 News/Product Launch