Brochure

Folded Motion
Drivers at Work.
How do you transform the breathtaking detail and
lightning-fast accuracy of the world’s best electro-
static transducers into more traditional loudspeaker
designs? That’s the (very) basic idea behind Martin-
Logan’s exclusive Folded Motion tweeter design—a
uniquely engineered thin-film diaphragm that fits
into a traditional speaker cabinet. This extremely
low mass diaphragm “squeezes” air, demanding
significantly less excursion than a typical dome
tweeter. Its folded design allows a much larger
surface area (compared to that of a regular 1-inch
dome tweeter), controlled dispersion characteristics,
and vanishingly low distortion—delivering much
of the high-frequency detail and speed of a large,
dynamic electrostatic panel in a small space.
Folded Motion XT tweeters, advanced thin-film
transducer technology even further, with a 40%
larger radiating surface. This increases audible
bandwidth without sacrificing details and mini-
mizes distortion to an unprecedented level while
increasing efficiency and the tweeter’s lightning-fast
response time. The result—superior realism.
High Magnetic Field Strength for Superb
Control and Efficiency. Folded Motion tweeters
incorporate neodymium iron boron (NIB) rare-earth
magnets, with field strengths almost 20 times those
of conventional magnet materials. Combining such
a powerful magnetic motor system with an extremely
lightweight diaphragm yields an outstanding force-to-
mass ratio. Folded Motion tweeters are very efficient
and always under perfect control. The sound that
results is pure MartinLogan, with super-low distor-
tion, astonishing clarity, and absolute precision.
Folded Motion Tweeters at Work. An array
of neodymium magnets hold constant charges. A
circuit trace on the folded polyamide diaphragm,
driven by the amplifier, is given a charge that
continuously reverses in reaction to the audio
signal. Opposite charges attract and like charges
repel, causing the diaphragm to “squeeze” air
like an accordion and produce sound as the
charges of the magnets and diaphragm interact.
Folded Motion XT Tweeter
Rigid Steel
Housing
Aluminum
Etched Folded
Polyamid
Diaphragm
Neodymium
Super Magnets