VRX932LA 12" Two-Way Constant Curvature Line Array
SHORT THROW
MID THROW
LONG THROW
1+
1-
2-
2+
1+
1-
2-
2+
1+
1-
2-
2+
1+
1-
2-
2+
NL4
INPUT
NL4
INPUT
HPF
LPF
PASSIVE
MODE
BI-AMP
MODE
-3 dB
0 dB
+3 dB
NL4
INPUT
NL4
INPUT
+
+
+
+
+
+
+
+
-
-
-
-
-
-
-
-
Block Diagram
Array Configuration Selector (ACS)
Amplitude shading is a technique that allows the coverage pattern of a loudspeaker
array to be shaped by adjusting the relative acoustic output of some of the devices in
the array. Most often, array shading involves only the mid and high-frequency sections
of the array. In a simple system consisting of three VRX932LAs, the lower speaker
(which covers the nearest listeners) may have its high-frequency output reduced. At the
same time, the upper speaker may have its high frequency output increased. The over-
all sound-power in the room is unchanged but the distribution of acoustic energy to the
audience is far more uniform. Amplitude shading of a VRX932LA array may be accom-
plished in passive or bi-amplified systems.
In passive mode, the Array Configuration Selector may be used. The -3 dB position
will typically be used for the speaker(s) in an array that are covering the nearest listen-
ing area. The +3 dB position will be used for the speaker(s) covering the more distant
areas, or to compensate for the low-frequency build-up resulting from mutual coupling
of multiple woofers in an array.
JBL PROFESSIONAL
Northridge, CA USA
Made in USA
Serial No.
PARALLEL
VRX932LA
BI-AMP
±
1 LF: 8
±
2 HF: 6
Ω
Ω
PASSIVE
±
1 IN: 6
±
2 N/C
Ω
VRX-AF Array Frame Accessory
The VRX-AF is an array frame kit designed to be used
for suspension of the VRX932LA line array loudspeaker.
The optional array frame kit includes an array frame, four
quick release pins, a pair of forged 3/8" shackles, and a
pair of drop levers.
The following table defines the maximum number of
speakers that may be suspended using the VRX-AF frame.
A minimum design factor of 7:1 is maintained for all
speaker configurations at or below thosed indicated in the
table.
Maximum number of VRX918S in array
6
5
4
3
2
1
0
Maximum number of VRX932LA in array
0
1
2
3
4
5
6
For some applications, it may be necessary to pull back the array from the bottom in order to achieve the
desired coverage. Every VRX-AF is supplied with a spare set of quick release pins and a pair of spare drop levers
that are used to adapt a second array frame to the bottom of a VRX932LA array. Once these are installed on the
bottom enclosure, the array frame may be attached as previously described.
Ground-stacked, upward aimed array: Applications such as covering stadium bleachers from the playing field
may be addressed by installing the VRX-AF array frame to the bottom of the array as described above. Up to four
VRX932LA loudspeakers may be locked together and ground stacked using the VRX-AF array frame kit, as shown.
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