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ó12 Dispersion Interactions
Figure 12–13. 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 14–15. 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 16–17. A controlled 30-degree cylindrical
wave-front, which is a MartinLogan exclusive,
offers optimal sound distribution with minimal
room interaction. The result is solid imaging with
a wide listening area.
In the field of loudspeaker design, 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 why most 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 exhaustive testing of these different solution attempts,
we found an elegantly simple, yet very difficult to execute
solution. 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. That is why you see the gentle
curve on our products.
Three Major Types of Dispersion