Electro-Voice X-Array Install Xi-1122-85 - Manual (Page 6)

X
-Array Install
TM
Xi-1122/85 Loudspeaker System
6
X-Array Install TM Xi-1122/85 Loudspeaker System
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 frequency
spectrum typical of close-miked rock music
was employed. The sound-pressure level was
normalized for an equivalent one-meter dis-
tance. Plots of second and third harmonic dis-
tortion are shown referenced to the fundamen-
tal.
Figure 4— Directivity
The directivity index, D
i
, and directivity fac-
tor, R
θ
(Q), of the system were measured with
a full spherical measurement system as de-
scribed for the "Polar Response."