Martinlogan i Manuel d'utilisateur télécharger pdf (Page 12)

12 Dispersion Interactions

Figure 18–19. 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 20–21. 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 22–23. 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.

Three Major Types of Dispersion

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 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 transduc-

ers. That is why you see the gentle curve on our products.

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Martinlogan i Manuel d'utilisateur Page 12