User Manual

5
Horizontal linking
Thanks to the use of small speaker units, the VXL series can deliver sound over an extremely wide dispersion angle
of 170° in the horizontal plane, however there are situations where a narrower angle better suits the installation
environment. In a situation where, for example, feedback is extremely difcult to control due to the installation of
line-array speakers at the back of the stage, the horizontal dispersion angle can be reduced in order to minimize the
amount of output going back into the microphones, thereby providing for more stable sound reinforcement.
The VXL series makes it possible to reduce the horizontal dispersion angle by positioning two linked arrays beside one
another. Figure 4 compares the frequency-specic directionality of two horizontally-linked VXL arrays to a single array
setup. With this type of conguration, the default dispersion angle of 170° can be tightened to approximately 120°.
And because the two horizontally-linked arrays are driven in phase, the total sound pressure can also be boosted by
6 dB. What’s more, the ultra slim VXL design ensures that installation of two horizontally-linked arrays does not detract
from their sleek overall appearance.
Key feature
3
Mixing models for scalability
In order to support a wide variety of diverse installations, the VXL series features three different array models—the
VXL1-8, VXL1-16, and VXL1-24—each containing a different number of speaker units. Furthermore, complete arrays
can also be combined and linked both horizontally and vertically for even greater scalability and exibility in adjusting
sound pressure and coverage area, in order to suit all kinds of installation environments and applications.
Vertical linking
By virtue of their behavior as a line source, line-array speakers boast less dispersion of sound in the vertical plane and
smaller attenuation of volume over distance; however, this advantage is not without limit. Beyond a certain distance, for
example, the sound begins to disperse upwards and downwards in a manner reminiscent of a point source, resulting
in a greater degree of attenuation. The distance over which the advantage is maintained is known as the effective
distance, and it is expressed as shown in Equation 1 below.
CD
=
(L
2
× f)
700
where CD
= Effective distance (m)
L
= Length of the line array (m)
f
= Frequency (Hz)
This calculation shows, for example, that the effective distance of a
single VXL1-24 (array length = 1.1 m approx.) is 3.3 m, and that for a
pair of vertically linked VXL1-24s (2.3 m approx.) is 15.0 m.
In other words, linking boosts the effective length of line-array speakers
by a factor of ve, thereby ensuring clearer and more even sound
reinforcement of speech in bigger venues or over longer distances.
Figure 4: Horizontal directionality of two linked arrays
(a) Single array (b) Two linked arrays