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13
consequently, bass will tighten and imaging will
become more coherent and detailed. It is best not
to use the spikes, however, until you are secure in
the positioning, as the spikes can damage the floor
if the speaker is moved.
Exposing the Spikes
Remove the rubber bumpers to expose the spikes
(see figure 6). If the speaker does not sit level loos-
en one spike until level is achieved.
Caution: Make sure your hands and any cabling
are clear of the spikes. Do not slide speaker as
spikes are sharp and can damage your floor or
carpet.
Caution: Walking the speaker may result in a
broken spike.
3/8"-16 Thread
Removable
Rubber Bumper
Plastic Body
threaded metal insert
Fig. 6
CONTROLLED HORIZONTAL DISPERSION
Your EM-ESL’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 11). 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
speakers project a controlled dispersion pattern
(see figure 12). Each EM-ESL 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
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