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Aurum Cantus AST (Aero Striction Tweeter) pneumatic transducers utilize a special flexible low-mass aluminum diaphragm that is carefully folded and then suspended in a highly saturated magnetic field. Source sounds are reproduced by the compression/expansion action of the diaphragm, resulting in incredibly instantaneous, accurate response. Highly efficient yet refreshingly honest, the Aurum Cantus AST30130 Aero Striction tweeter is in a class of its own. Recommended minimum crossover frequency: 1,000 Hz.