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TM
X-Array Install
Xi-2123/106 Loudspeaker System
Figure 2—Frequency Response
The frequency response of the system was
measured on axis in the farfield in an
anechoic environment using a swept sine-
wave signal. The ISP-100 digital electronic
unit was used to provide the necessary
three-element-line-array crossover filters,
equalization and time delay. One-half watt
of power (2.83 volts rms at 1000 Hz) was
applied to the midband of the midbass sec-
tion. The sound-pressure level was nor-
malized for an equivalent one-meter dis-
tance.
Figure 3—Beamwidth
The beamwidth of the system, (i.e., the in-
cluded horizontal and vertical coverage
angles at the -6-dB points) 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
, of the system were measured with a
θ
full spherical measurement system as de-
scribed for the Polar Response.
Figure 5—Distortion
Distortion for the system was measured
on axis in the farfield in an anechoic envi-
ronment with an input signal that would
result in a sound-pressure level of 115 dB
at one meter. The ISP-100 digital electronic
unit was used to provide the necessary
three-element-line-array crossover filters,
equalization and time delay. A frequency
spectrum typical of close-miked rock mu-
sic 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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