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EVC Variable-Intensity Loudspeaker
3
Planning the installation and aiming of the EVC-1122-VI
loudspeaker
The remarkably even coverage of the EVC-1122-VI is due not only to the unique, compound
waveguide, but is also the result of the woofer mounting angle, the spacing between woofer
and horn, and the enclosure configuration. The speaker is designed to be mounted with the
waveguide on the bottom and the woofer facing forward. This means that when installed in
the proper orientation, the grille will cover the bottom and the angled front baffle. Another
visual indicator for confirming that the loudspeaker is oriented correctly is that the EV logo is
attached to the grille in front of the woofer, and should therefore be on the front face of the
loudspeaker when viewed head on. The largest rectangular surface of the speaker should face
upward. Note that the waveguide cannot be rotated, and the loudspeaker will only exhibit its
characteristic, predictable coverage when installed as described above.
The size of the rectangular area that the loudspeaker will cover is determined by its mounting
height, as measured from the bottom rear of the loudspeaker. The horizontal coverage pattern
will maintain a width that is approximately twice as wide as the mounting height
measurement; the vertical throw will be about three times the mounting height. There is a
small area of reduced coverage on the floor directly in front of the loudspeaker, which will
help increase the gain-before-feedback margin in the area where the presenter or musicians
will likely be located. Full coverage starts at a distance equal to 6/10 of the mounting height.
These combined coverage parameters can be approximated with a simple 3:2:1 rule that
makes it easy to estimate coverage during the design phase of a project.
You can extend or reduce the vertical throw by adjusting the aiming angle of the loudspeaker.
Note that this will change both the front and rear boundaries of the coverage area, since both
are affected by aiming. The new vertical coverage extremes are defined by the following
equations:
These values can easily be determined with the help of a scientific calculator with
trigonometric functions. The tilt angle should be entered in degrees, but the mounting height
can be in either English or metric units. Vertical aiming has no material effect on horizontal
coverage over the audience area.
Figure 3.1: Coverage area determined by mounting height and angle
2018.01 | 01 | F.01U.345.997
Beginning of vertical coverage = tan(31.0° ± tilt angle) x mounting height
Limit of vertical coverage = tan(71.6° ± tilt angle) x mounting height
Installation manual
Electro-Voice
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