JBL VRX928LA User Manual
8" Two-Way Line
Array Loudspeaker
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
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.
System
VRX928LA 8" Two-Way
Line Array Loudspeaker
System
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
Specifications:
Frequency Range (-10 dB): 70 Hz -20 kHz
Frequency Response (±3 dB): 87 Hz - 19 kHz
(Continuous / Program / Peak): Bi-amp LF: 400 W / 800 W / 1600 W
System Sensitivity (1w @ 1m): 90 dB SPL (passive mode)
1
IEC filtered noise with 6 dB crest factor, 2 hours.
2
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.
Coverage Pattern: 100° x 15° nominal (horizontal x vertical), single unit
Crossover Modes: Bi-amp / passive, externally switchable
Crossover Frequency: 2.0 kHz
Power Rating
System Maximum SPL
Nominal Impedance: Passive: 18 ohms
Active Tunings: Tunings available at www.jblpro.com
Suspension / Mounting: Dual 36 mm pole socket included. Suspension requires optional
Input Connectors: Neutrik®Speakon NL-4 (x2)
Dimensions (H x W x D): 230 mm x 419 mm x 267 mm
Net Weight: 12.7 kg (28 lb)
Optional Accessories: VRX928LA-SMAF: Suspension Array Frame
1
: 400 W / 800 W / 1600 W
Bi-amp HF: 130 W / 60 W / 120 W
2
: 122 dB SPL peak (passive mode)
LF: 122 dB (bi-amp mode)
HF: 128 dB (bi-amp mode)
LF: 90 dB (bi-amp mode)
LF Driver: 1 x JBL 2168H-1, 200 mm (8 in) Differential Drive®woofer
HF Driver: 2 x JBL 2414H, 25 mm (1.0 in) neodymium compression driver
Enclosure: 15 mm - 25 mm, multi-ply birch plywood
Transport: Integrated handle with backing cup
HF: 108 dB (bi-amp mode)
Bi-amp LF: 18 ohms
Bi-amp HF: 16 ohms
VRX-SMAF line array frame kit or M10 eyebolts.
Finish: Black DuraFlex™ finish
Grille: Powder coated, black, 18 gauge perforated steel with
acoustically transparent black foam backing.
(9.0 in x 16.5 in x 10.5 in)
SS2-BK: Tripod Speaker Stand
SS3-BK: Satellite Speaker Pole
SS4-BK: Adjustable satellite speaker pole to be used with
VRX915S or VRX918S.
VRX928LA 8" Two-Way Line Array Loudspeaker System
Block Diagram
NL4
INPUT
PASSIVE
MODE
NL4
INPUT
LONG THROW
MID THROW
1+
1-
2+
2-
1+
1-
2+
2-
SHORT THROW
LPF
+3 dB
0 dB
-3 dB
HPF
NL4
INPUT
BI-AMP
MODE
NL4
INPUT
1+
1-
2+
2-
1+
1-
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
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.
uniform.
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.
Array Configuration Selector
HF Output Level
Long
Throw
+3 dB
Mid
Throw
Single Speaker
Short Throw
PASSIVE
0 dB
-3 dB
or
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.
BI-AMP
VRX928LA
PASSIVE
⑁
±1 IN: 8
±2 N/C
BI-AMP
⍀
±1 LF: 8
⍀
±2 HF: 16
Serial No.
N108
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 654320
Maximum number of VRX915S in array 022234
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.
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