DeltaMax
TM
DMS-1152/64 Loudspeaker System
DeltaMax
TM
DMS-1152/64 Loudspeaker System
6
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 described 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 Dx34 digital electronic
unit was used to provide the necessary
crossover filters, equalization and time de-
lay. A frequency 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.
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 mea-
sured with a full spherical measurement
system as described in "Polar Response."
