Beamwidth; Directivity; Distortion - Electro-Voice Xi-1152/64 Instructions Manual

X-Array Install™ Xi-1152/64 Loudspeaker System
Figure 3—Beamwidth
The beamwidth of the system, (i.e., the in-
cluded horizontal and vertical coverage
angles at the 6-dB down point) was measured
with a full spherical measurement system as
described in "Polar Response."
Figure 4—Directivity
The directivity index, D , and directivity fac-
i
tor, R (Q), of the system were measured
θ
with a full spherical measurement system as
described for the "Polar Response."
Figure 5—Distortion
Distortion for the system was measured on
axis in the farfield in an anechoic environ-
ment with an input signal that would result
in a sound-pressure level of 115 dB at one
meter. The DN8000 digital electronic unit
was used to provide the necessary crossover
filters, equalization and time delay. A fre-
quency spectrum typical of close-mic'd rock
music was employed. The sound-pressure
level was normalized for an equivalent one-
meter distance. Plots of second and third
harmonic distortion are shown referenced to
the fundamental.
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