d&b audiotechnik xC 24C-E, Руководство пользователя

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2.1.3. Cardioid dispersion
Due to their dimensions, conventional column loudspeakers
provide no significant horizontal directivity below 2 kHz.
At low and mid frequencies, the resulting polar pattern is almost
omni-directional (dotted line).
The cardioid patterns of the 24C and 24C-E show a much higher
directivity resulting in much less energy radiated into the room
(continuous line).
Typically, column loudspeakers are mounted onto walls or other
hard plane surfaces. Hard surfaces act as an acoustic mirror. That
means, the room is not only covered by the sound of the actual
column loudspeaker but also by the sound produced by its virtual
mirror source from "behind".
In the case of conventional column loudspeakers with their low
horizontal directivity, the mirror source radiates at a similar level as
the loudspeaker itself.
The combination of both sources results in a dipolar characteristic
where the main energy is radiated along the walls (dotted line).
The 24C and 24C-E, however, with their cardioid dispersion
patterns provide an even dispersion characteristic and a useful
directivity when mounted onto a wall.
d&b 24C / 24C-E Manual 1.1 en 6