ATF Operation
The MartinLogan ATF transducer (based on RADIA planar technology) consists of a micro-thin, low-mass Kaladex diaphragm with an ultra-light, etched conductive aluminum surface suspended between two high field strength neodymium super magnet arrays (see figure 27). When an electrical current (music signal) passes through the etched aluminum on the diaphragm's surface it is simultaneously pulled towards one of the neodymium arrays and pushed away from the opposing array. When the direction of current is reversed the diaphragm is simultaneously pushed and pulled in the opposite direction, thus producing sound.
Extremely Low-Mass Diaphragm
—Blazing Speed and Inner Detail
Low-mass diaphragms are crucial to a loudspeakers ability to accurately reproduce sound. As the mass of a transducer's diaphragm decreases, its ability to resolve detail increases. With extremely low-mass characteristics, the ATF transducer tracks the audio signal with almost perfect accuracy.
MartinLogan ATF diaphragms are constructed of extremely low mass Dupont Kaladex® PEN (polyethylene naphthalate) —a material chemically similar to the low-mass PET (polyethylene terathylate) film used in MartinLogan's generation 2 electrostatic transducers, yet capable of handling the high thermal requirements required for stable magnetic thin film operation.
High Field Strength—Superb Control and Efficiency With a field strength almost 2000% more powerful than traditional systems, Neodymium iron boron (NIB) rare- earth super magnets are one of the world's strongest commercially available magnetic materials. This incredible field strength proves ideal for maintaining perfect control over the low-mass Kaladex diaphragm. Super-low distortion levels, high-resolution, and crystal- clear transparency are just a few of the benefits resulting from this superb combination of low-mass diaphragm and high field strength.
Push-Pull Operation = Ideal Linearity
Linearity is another factor contributing to a loudspeaker's ability to achieve ultimate clarity, detail and resolution. By positioning neodymium magnet arrays in a push- pull configuration, MartinLogan ATF transducer technology maintains uniform diaphragm control, regardless of position as it traverses the entire audio signal. The push- pull concept is a major contributor to the linearity and sonic superiority of ATF transducers.
Direct Full-Surface Drive
Provides Outstanding Clarity
Unlike traditional voice coil driven systems, ATF diaphragms are directly and uniformly driven throughout their entire surface. This full-surface drive system results in ultra-fast transient response with no cone break up and the ability to accurately reproduce sound with great delicacy, nuance and clarity.
Figure 27. Cut away view of an ATF transducer. Note the simplicity due to minimal parts usage.
