The Air Motion Transformer tweeter works by pushing air out perpendicularly from the pleated diaphragm. Its diaphragm is the folded pleats of film (typically PET film) around aluminium struts held in a strong magnetic field. In past decades, ESS of California produced a series of hybrid loudspeakers using such tweeters, along with conventional woofers, referring to them as Heil transducers after their inventor, Oskar Heil. They are capable of considerable output levels and are rather more sturdy than electrostatics or ribbons, but have similar low-mass moving elements.

Most of the current AMT drivers in use today are similar in efficiency and frequency response to the original Oskar Heil designs of the 1970s.

 

Rated Impedance 4Ω Front Panel Iron
Sensitivity 88dB Finish of Panel Powder coat
Frequency Range 3k~40k Hz Diaphram KAPTON
RMS Power 15W Conductive Line Alumium foil
Max Power 30W Magnet Neodymium
Lowest crossover 3.5k Hz(recommend) Terminal (mm) 4.8*0.5(+);2.8*0.5(-)

Size in MM: Dia 40.5 *17MM