Isodynamic and Airmotion tweeters. The AT tweeters are based on air motion technology for the most demanding high-end applications. This AMT ensure a neutral and detailed sound. In addition, the large membrane surface and low weight allow a high sound pressure without large amplitudes. Tweeters with outstanding sound characteristics. With the GAM 100 we have an isodynamic tweeter with a very high level in the range. It is predestined to create sound with powerful speakers above 93 dB SPL.