MartinLogan ElectroMotion ESL X [15/60] Ispersio
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MartinLogan ElectroMotion ESL X [15/60] Ispersio

MartinLogan ElectroMotion ESL X [15/60] Ispersio
15
CONTROLLED HORIZONTAL DISPERSION
Your EM-ESL X’s launch a 30 degree horizontal
dispersion pattern. This horizontal dispersion field
gives a choice of good seats for the performance
while minimizing interactions with side walls (see
figure 13). Make sure both speakers stand exactly
at the same vertical angle, otherwise the image
can be skewed or poorly defined. The wave
launch of both speakers is extremely accurate in
both the time and spectral domain. Consequently,
small refined adjustments can result in noticeable
sonic improvements.
CONTROLLED VERTICAL DISPERSION
As you can see from the illustrations, your EM-ESL
X speakers project a controlled dispersion pattern
(see figure 14). Each EM-ESL X is a 34 inch line
source. This vertical dispersion profile minimizes
interactions with the floor and the ceiling.
THREE MAJOR TYPES OF DISPERSION
It is a known fact that as the sound wave becomes
progressively smaller than the transducer producing
it, the dispersion of that wave becomes more and
more narrow, or directional. This fact occurs as
long as the transducer is a flat surface. Large flat
panel speakers exhibit venetian blind effects due
to this phenomenon. This is one reason why many
manufacturers opt for small drivers (i.e. tweeters
and midrange) to approximate what is known as a
point source wave launch.
Historically, most attempts to achieve smooth dis-
persion from large flat panel transducers resulted
in trade-offs. After exhaustive testing of many differ-
ent methods, we conceived an elegantly simple, yet
intensely hand crafted process. By curving the radiat-
ing surface, we create the effect of a horizontal arc.
This allows the engineers at MartinLogan to control the
high frequency dispersion pattern of our transducers.
dIsPersIon InteractIons
Figure 9–10. As can be seen here,
point source concepts invite a great
deal of room interaction. While deliv-
ering good frequency response to a
large listening audience, imaging is
consequently confused and blurred.
Figure 11–12. Even though they
suffer from “venetian blind” effect,
angled multiple panel speakers can
deliver good imaging, but only to
specific spots in the listening area.
Figure 13–14. A controlled 30
degree cylindrical wave-front, a
MartinLogan exclusive, offers optimal
sound distribution with minimal room
interaction. The result is solid imaging
with a wide listening area.

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