I'd like to know that too. On first blush it looks very similar to plasma tweeter technology, but they say this on their website:
"Nearest to the electric-speaker sound on the type of radiation - ionophone using corona discharge as the source of the sound vibrations and operating on the basis of an electron tube. They are produced by firms and Acapella Lanshe Audio, used mainly for domestic loudspeakers above firms and mass are made. These disadvantages include high cost, inability to extreme operating conditions such as unstable network and a large vibration load. Time to the operating mode, the power consumption and the limited lifespan of the lamp and the electrode also do not relate to the merits ionophone.
Arc speaker devoid of the above drawbacks because of design features and has no direct analogues in the market sound emitters, because it lacks the mobile system, the frequency response of his uniform, and the frequency range up to ultrasonic frequencies. The market potential of its application is very extensive due to the lack of competition in this segment. It can be used in the studio and home audio systems, professional audio systems for scoring the club halls, concert venues, the potential for its use in automotive acoustics. Qualitative development of traditional loudspeakers is currently in an evolutionary dead end - with their help it is impossible to create a speaker system that has really high precision sound, which may be obtained by using an electric loudspeaker."
... this implies that they are using a different technology to plasma tweeters. Intriguing, I have never heard of this before. Time to do more googling. If I find something, I will report in this thread.