Electro-Voice XI-2181 - Manual (Page 5)

Xi-2181 Bass System
Xi-2181 Bass System
5
Xi-2181 Bass System
DIRECTIVITY F
A
CT
OR R
θ Q
Without Crossover and EQ
With Crossover and EQ
Figure 4 — Directivity
The directivity index, D
i
, and directivity fac-
tor, R , of the Xi-2181 were measured with a
full- spherical measurement system as de-
scribed in Figure 1.
Figure 3 — Beamwidth
The beamwidth of the Xi , (i.e., the included
horizontal and vertical coverage angles at the
-6-dB points) was measured with a full-
spherical measurement system as described
in Figure 1.
Figure 2 — Frequency Response
The frequency response of the Xi was mea-
sured on axis in the far field in an anechoic
environment using a swept sine-wave sig-
nal. One watt of power (2.00-volts rms at
70 Hz) was applied to the mid band of the
low-frequency section. The sound pressure
level was normalized for an equivalent one-
meter distance.