VRX928LA Spec Sheet
VRX928LA
8" Two-Way Line
Array Loudspeaker
System
Key Features:
JBL’s exclusive neodymium magnet
Differential Drive® woofer for highpower capacity and lightweight.
Two patent-pending neodymium HF
compression drivers.
Constant Curvature waveguide for
unprecedented array coherence
Fly combinations of VRX928LA and
Subwoofers (VRX915S) with optional
array frame (VRX-SMAF)
Integral rigging hardware for simple
connection of enclosures and optional
array frame. Arrays of up to six
enclosures may be flown.
Dual angle pole socket for aiming
flexibility. One or two speakers may be
mounted to a 35 mm pole or tripod
stand.
Array Configuration Selector permits
“array shading” in passive mode.
Application:
Music playback and sound
reinforcement in small to mid-size
venues.
Entertainers, corporate A/V professionals
and sound system hire companies.
Permanent installations.
VRX928LA 8" Two-Way
Line Array Loudspeaker
System
subwoofer. The integral rigging hardware is used to securely lock the array
together.
As many as six VRX928LA speaker systems may be suspended in a single array
for a nominal vertical coverage of up to 90°. Suspended applications require the
JBL VRX928LA-SMAF array frame (available separately). For applications in which
the array must be aimed sharply down, a second Array Frame may be installed to
the bottom of the array serving as a pull-back.
The VRX928LA is manufactured and sold under U.S. patents 5,748,760; 6,112,847; 6,394,223; 6,847,726, and D483,744.
Specifications:
Frequency Range (-10 dB):
Frequency Response (±3 dB):
Coverage Pattern:
Crossover Modes:
Crossover Frequency:
Power Rating1:
(Continuous / Program / Peak):
The VRX928LA is a lightweight
(28 lb / 13 kg) compact 8" two-way linearray speaker system designed for use in
arrays of up to six units. VRX928LA is
the ideal choice when line-array
performance is needed but the venue
size doesn’t call for the very long-throw
characteristics of larger line-arrays such
as JBL’s VERTEC or VRX932LA.
The Constant Curvature waveguide
mounts two compression drivers on a
continuous arc. When additional
VRX928LA speakers are added to the
array the uninterrupted arc continues. In
effect, all the drivers work together as if
they were a single driver on a very long
waveguide. Since there are two HF
drivers in each VRX928LA, the combined
power handling and acoustic output of
the system is far greater than a single
driver could achieve.
VRX928LA uses “amplitude shading”
to shape the coverage of the array.
Switches on the input plate allow, for
example, the upper box in an array to
reach the distant rear of a room while
the lower box is shaded back to reduce
excessive level at the front of the
listening area.
One or two VRX928LAs may also be
used on a tripod or over the VRX915S
System Maximum SPL2:
System Sensitivity (1w @ 1m):
LF Driver:
HF Driver:
Nominal Impedance:
Active Tunings:
Enclosure:
Suspension / Mounting:
Transport:
Finish:
Grille:
Input Connectors:
Dimensions (H x W x D):
Net Weight:
Optional Accessories:
70 Hz -20 kHz
87 Hz - 19 kHz
100° x 15° nominal (horizontal x vertical), single unit
Bi-amp / passive, externally switchable
2.0 kHz
400 W / 800 W / 1600 W
Bi-amp LF: 400 W / 800 W / 1600 W
Bi-amp HF: 130 W / 60 W / 120 W
122 dB SPL peak (passive mode)
LF: 122 dB (bi-amp mode)
HF: 128 dB (bi-amp mode)
90 dB SPL (passive mode)
LF: 90 dB (bi-amp mode)
HF: 108 dB (bi-amp mode)
1 x JBL 2168H-1, 200 mm (8 in) Differential Drive® woofer
2 x JBL 2414H, 25 mm (1.0 in) neodymium compression driver
Passive:
18 ohms
Bi-amp LF: 18 ohms
Bi-amp HF: 16 ohms
Tunings available at www.jblpro.com
15 mm - 25 mm, multi-ply birch plywood
Dual 36 mm pole socket included. Suspension requires optional
VRX-SMAF line array frame kit or M10 eyebolts.
Integrated handle with backing cup
Black DuraFlex™ finish
Powder coated, black, 18 gauge perforated steel with
acoustically transparent black foam backing.
Neutrik® Speakon NL-4 (x2)
230 mm x 419 mm x 267 mm
(9.0 in x 16.5 in x 10.5 in)
12.7 kg (28 lb)
VRX928LA-SMAF: Suspension Array Frame
SS2-BK: Tripod Speaker Stand
SS3-BK: Satellite Speaker Pole
SS4-BK: Adjustable satellite speaker pole to be used with
VRX915S or VRX918S.
IEC filtered noise with 6 dB crest factor, 2 hours.
Calculated, based on power rating and sensitivity.
JBL continually engages in research related to product improvement. Some materials, production methods and design
refinements are introduced into existing products without notice as a routine expression of that philosophy. For this
reason, any current JBL product may differ in some respect from its published description, but will always equal or
exceed the original design specifications unless otherwise stated.
1
2
VRX928LA 8" Two-Way Line Array Loudspeaker System
Block Diagram
LONG THROW
+3 dB
0 dB
MID THROW
NL4
INPUT
1+
12+
2-
HPF
NL4 1+
INPUT 1-
-3 dB
2+
2-
SHORT THROW
BI-AMP
MODE
PASSIVE
MODE
NL4
INPUT
1+
1-
LPF
NL4 1+
INPUT 1-
2+
2-
2+
2-
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
VRX928LAs, 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 overall sound-power in the room is unchanged
but the distribution of acoustic energy to the audience is far more
uniform.
+3 dB
Mid
Throw
0 dB
JBL PROFESSIONAL
Northridge, CA USA
Made in USA
WARNING:
Do not attempt to
suspend unless you
have
read
and
fully understood all
instructions. Follow
all applicable local
ordinances.
Attachment of the
loudspeaker to any
supporting structrue
should be referred
to
a
qualified
professional.
VRX928LA
Array Configuration Selector
HF Output Level
Long
Throw
PASSIVE
BI-AMP
-3 dB
Single Speaker
or
Short Throw
PASSIVE
±1 IN: 8⑁
±2 N/C
BI-AMP
±1 LF: 8 ⍀
±2 HF: 16 ⍀
Serial No.
®
Equipped with Differential Drive Transducer Technology
Manufactured Under U.S. PATENTS: 5,748,760, 6,112,847,
6,394,223, 6,768,806, 6,774,510, 6,847,726, and D483,743.
N108
Amplitude shading of a VRX928LA array may be accomplished 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 listening 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. In bi-amp mode the amplifier output needs to be adjusted
accordingly.
VRX928LA-SMAF Array Frame Accessory
The VRX928LA-SMAF is an array frame kit designed to
be used for suspension of the VRX928LA line array
loudspeaker. The optional array frame kit includes an
array frame, two 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-SMAF
frame. A minimum design factor of 7:1 is maintained for
all speaker configurations at or below those indicated in
the table.
Maximum number of VRX928LA in array
Maximum number of VRX915S in array
6
0
5
2
4
2
3
2
2
3
0
4
For some applications, it may be necessary to pull back the array from the bottom in order to achieve the
desired coverage. Every VRX-SMAF 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 VRX928LA array. Once these are installed on
the bottom enclosure, the array frame may be attached as previously described.
Ground-Stacked, Upward Firing Arrays: Applications may be addressed by installing the VRX-SMAF array frame
to the bottom of the array as described above. Up to four VRX928LA loudspeakers may be locked together and
ground stacked using the VRX-SMAF array frame kit.
Dimensions
419
(16.5)
267
(10.5)
230
(9.1)
R876
(R34.5)
115
(4.5)
C
L
15°
FRONT
210
(8.3)
127
(5.0)
TOP
SIDES
REAR
Dimensions in mm (in)
BOTTOM
System Configurations
With SS4-BK
Ground-stacked
with VRX-SMAF
With SS4-BK
on VRX915S
With VRX915S
and VRX-SMAF
VRX928LA 8" Two-Way Line Array Loudspeaker System
Frequency Response
105
HF +3dB
HF 0dB
HF -3dB
SPL (dB)
95
85
75
65
20
100
1000
10000
20000
10000
20000
Frequency (Hz)
Horizontal Beamwidth
-6 dB Beamwidth (degrees)
360
100
10
20
100
1000
Frequency (Hz)
Vertical Beamwidth
-6 dB Beamwidth (degrees)
360
100
1x VRX928LA
3x VRX928LA
10
20
100
1000
10000
20000
Frequency (Hz)
JBL Professional
8500 Balboa Boulevard, P.O. Box 2200
Northridge, California 91329 U.S.A.
A Harman International Company
© Copyright 2007 JBL Professional
SS VRX928LA
CRP 5M
03/07
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