MartinLogan ElectroMotion ESL X [20/60] Istory
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MartinLogan ElectroMotion ESL X [20/60] Istory

MartinLogan ElectroMotion ESL X [20/60] Istory
20
In the late 1800’s, any loudspeaker was
considered exotic. Today, most of us take the
wonders of sound reproduction for granted.
It was 1880 before Thomas Edison had invented
the first phonograph. This was a horn-loaded
diaphragm that was excited by a playback
stylus. In 1898, Sir Oliver Lodge invented a
cone loudspeaker, which he referred to as a
“bellowing telephone”, that was very similar to
the conventional cone loudspeaker drivers that we
know today. However, Lodge had no intention for
his device to reproduce music because in 1898
there was no way to amplify an electrical signal!
As a result, his speaker had nothing to offer over
the acoustical gramophones of the period. It was
not until 1906 that Dr. Lee DeForrest invented the
triode vacuum tube. Before this, an electrical signal
could not be amplified. The loudspeaker, as we
know it today, should have ensued then, but it did
not. Amazingly, it was almost twenty years before
this would occur.
In 1921, the electrically cut phonograph record
became a reality. This method of recording was
far superior to the mechanically cut record and
possessed almost 30 dB of dynamic range.
The acoustical gramophone couldn’t begin to
reproduce all of the information on this new disc.
As a result, further developments in loudspeakers
were needed to cope with this amazing new
recording medium.
By 1923, the decision to develop a complete
electrostatIc HIstory
XSTAT™ TRANSDUCER
XStat™ transducers incorporate a myriad of
technology and design innovations including
CLS™, MicroPerf, Generation 2 Diaphragms,
ClearSpars™, and Vacuum Bonding.
MICROPERF STATOR
Sleek. Compact. MicroPerf stator technology,
featured in EM-ESL X’s electrostatic transducer,
reveals more open playable area in each panel,
offering increased performance from even more
compact stat panels. It is significant to note that the
electrostatic transducer in the radical new EM-ESL
X loudspeaker supports the bandwidth and
dynamics associated with traditional electrostatic
panels nearly twice its size.
VACUUM BONDING
To achieve the power, precision, and strength of
the electrostatic transducer, two insulated high-
purity carbon steel stators along with a proprietary
plasma bonded diaphragm and ClearSpar™
spacers are fused into a curved geometry with
an aerospace adhesive whose strength exceeds
that of welding. Our proprietary Vacuum Bonding
process guarantees uniform diaphragm tensioning
and extremely precise construction tolerances,
resulting in unequivocal precision, linearity and
efficiency.
AIRFRAME™ TECHNOLOGY
Ultra-rigid extruded aerospace grade aluminum
alloy AirFrame™ technology rigidifies and secures
the electrostatic panel to the woofer cabinet while
at the same time providing sonic and electrical
isolation. Advanced AirFrame™ technology
maximizes the electrostatic panels playable
surface area and dipole dispersion pattern while
minimizing potentially acoustically destructive
intermodulated distortion caused by spurious
vibrations and resonance. The result? Ultimate
imaging capability, low-level detail resolution,
improved efficiency and overall accuracy.

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