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17
DISPERSION INTERACTIONS
Controlled Horizontal Dispersion
Your Neolith’s launch a 30 degree horizontal dispersion pat-
tern. This horizontal dispersion field gives a choice of good
seats for the performance while minimizing interactions with
side walls (figure 18). Make sure both speakers stand exact-
ly 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 notice-
able sonic improvements.
Controlled Vertical Dispersion
As seen in the illustrations, your Neolith speakers project a con-
trolled dispersion pattern (figure 19). 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 progres-
sively 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 dispersion from
large flat panel transducers resulted in trade-offs. After exhaus-
tive testing of many different methods, we conceived an
elegantly simple, yet intensely hand crafted process. By curving
the radiating 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.
Figure 14–15. As can be seen here, point
source concepts invite a great deal of room
interaction. While delivering good frequency
response to a large listening audience, imaging
is consequently confused and blurred.
Figure 16–17. 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 18–19. A controlled 30 degree cylindri-
cal wave-front, a MartinLogan exclusive, offers
optimal sound distribution with minimal room
interaction. The result is solid imaging with a
wide listening area.
English
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