crossover
switch located on top of cabinet
for quick access
Switchable crossover network
allows SMPTE/ISO2969 Curve X
high frequency de-emphasis for
cinema surround installations or
flat response for foreground
applications
Approved by Lucasfilm, Ltd. for
THX
®
installation
In-cabinet mounting hardware
accepts Omnimount
®
or wall
brackets for fast installation
Tight-cluster design of components
for uniform horizontal and vertical
dispersion
25 mm (1 in) high frequency
dome radiator
130 mm (5 in) midrange
loudspeaker,
203 mm (8 in) low frequency
loudspeaker,
40 Hz to 20 kHz Frequency Range
91 dB SPL 1 W, 1 m (3.3 ft)
100 W Power Capacity, continuous
pink noise
Components:
Specifications:
SYSTEM:
MIDRANGE LOUDSPEAKER:
Frequency Range ( — 10 dB): 40 Hz to 20 kHz
Frequency Response ( ± 3 dB): 70 Hz to 14 kHz
Power Capacity¹: 100 W continuous pink noise
Sensitivity²: 91 dB SPL, 1 W, 1 m (3.3 ft)
Directivity²: Factor (O): 3
Index (DI): 4.8 dB
Nominal Impedance: 8 ohms
Crossover Frequencies: 650 Hz and 3.1 kHz
Polarity: Positive voltage to black terminal causes outward
low-freauency cone motion.
LOW FREQUENCY LOUDSPEAKER:
Material: Laminated high polymer cone
Nominal Diameter: 201 mm (8 in)
Material: Laminated high polymer cone
Nominal Diameter: 130 mm (5 in)
HIGH FREOUENCY LOUDSPEAKER:
Material: Titanium laminate dome
Nominal Diameter: 25 mm (1 in)
GENERL:
Finish: Black vinyl
Grille Color: Dark grey
Dimensions (H x W x D): 494 mm x 481 mm x 257 mm
19 7/16 in x 18 15/16 in x 10 1/8 in
Net Weight: 14 kg (31 lbs)
¹Rating based on test signal of IEC filtered random noise with a peak-to-average ratio of 6 dB, two hours duration
²Averaged from 500 Hz to 2.5 kHz. 1 W is 2.83 V @ 8 ohms.
JBL continually engages in research related to product improvement. New 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 stared. 8330 Surround Foreground Music System
The JBL Industrial Series Model 8330 loudspeaker
system offers sound contractors and audio system
designers a professional quality alternative to conven-
tional “foreground music” speakers. Its wideband
response and high reliability make it ideal for use as a
theatre surround, and in retail establishments, restaurants,
lounges and other commercial applications.
The three-way system features a 200 mm (8 in) low fre-
quency driver for smooth, extended bass response, a 130
mm (5 in) midrange transducer for the critical midrange
frequencies, and a 25 mm (2 in) titanium-laminate dome
tweeter to provide broad, even coverage of the high fre-
quencies. A dual-purpose, switchable crossover network
makes the Model 8330 ideal for both cinema surround
and commercial foreground music installations such as
restaurants, retail establishments, and lounges. The special
tight-cluster arrangement of the transducers, in conjunc-
tion with the crossover network design, provides uniform
polar response in both the horizontal and vertical planes.
The enclosure is constructed of dense stock in a unique
cabinet shape which reduces internal resonances while
providing a U-degree down aiming angle for the trans-
ducers. The location of the crossover network on the top
panel permits easy access to the network switch and input
terminals, subsequent to speaker mounting. Six internal
“T” nuts allow quick attachment of Omnimount or other
mounting hardware without opening the cabinet. Enclo-
sure finish is satin black vinyl, with a dark grey grille.
The Model 8330 offers many of the same design features
found in JBL’s prestigious line of studio monitors. The
crossover network has bypass capacitors wired in parallel
with the larger active capacitor values in the circuit to
reduce hysteresis effects on the signal. This provides
improved resolution of complex transient waveforms. The
woofer and midrange cones utilize a laminated high poly-
mer composite which provides a combination of optimum
stiffness, mass, and internal damping to ensure that the
cone behaves more like a true piston. The tweeter dome
is laminated with vapor deposited titanium in order to
obtain both the structural integrity of a “hard” dome and
the damping characteristics of a traditional soft dome. A
unique acoustic “contact lens” is an integral part of the
tweeter design, and provides flatter high-frequency
response by shadowing the center section of the dome.
Built to traditional JBL standards of quality and preci-
sion, the loudspeakers are subjected to stringent tests to
ensure that the materials and adhesives will stand up to
long-term use under adverse conditions.
Omnimount is a registered trademark of Omnimounr Systems.
THX is a registered trademark of Lucasfilm, Ltd.
Frequency Response at 1 W, 1 meter; Impedance
(Both positions of HF switch shown)
Beamwidth ( — 6 dB) vs. Frequency
Distortion vs. Frequency, 10 W (distortion raised 20 dB) Energy-Time Curve (time span, 0 to 20,204 microseconds; vertical
divisions 6 dB; loundspeaker placed one meter from microphone).
Note that the bulk of the loudspeaker’s energy arrives at the
microphone coherently.
than 494 mm (19 /
16
in) high by 481 mm (18
15
/
16
in) wide by 257 mm
The system shall be JBL Industrial Series Model 8330.
The frequency dividing network shall have crossover frequencies
of 650 Hz and 3.1 kHz and shall be of the parallel L-C type. Polypro-
pylene and/or polystyrene bypass capacitors shall be wired in parallel
with the network’s larger non-polarized electrolytic capacitors to
reduce the hysteresis effects on the signal. The frequency dividing net-
work shall be equipped with a two-position switch to allow selection
of two high-frequency response curves. One curve shall be consistent
with the IS0 2969 Curve X specification and the other curve shall cor-
respond to the nominal system design (flat) response.
Performance specifications of a typical production unit shall be as
follows: Measured sensitivity (SPL at 1 m (3.3 ft) on axis with 2.83 volts
input, swept 500 Hz-Z.5 kHz) shall be at least 91 dB SPL. Usable fre-
quency range shall extend from 40 Hz to 20 kHz. On-axis response,
measured at a distance of 2 m (6.6 ft) or more under free-field condi-
tions shall be ± 3 dB from 70 Hz to 14 kHz. Nominal impedance shall
be 8 ohms, Rated power capacity shall be at least 100 watts continuous
pink noise, based on test signal of filtered random noise conforming
to international standard IEC 268-5 two hours duration.
The enclosure shall be solidly constructed of ¾ inch stock with all
joints tightly fitted and glued. Overall dimensions shall be no greater
7
Six T-nuts and bolts shall be provided, one on each side panel and
four on the rear panel for attaching Omnimount or other mounting
hardware.
Architectural Specifications:
The loudspeaker system shall consist of a 203 mm (8 in) low fre-
quency loudspeaker, 130 mm (5 in) midrange loudspeaker, 25 mm
(1 in) dome high frequency driver, and frequency dividing network
installed in a ported enclosure. The frame of the low frequency and
midrange transducers shall be manufactured of stamped steel, and
their magnetic assembly shall utilize a ferrite magnet. The low fre-
quency voice coil shall be 38 mm (1% in) in diameter and shall be
made of round-wound copper.
(10
1
/
8
in) deep. Finish shall be black vinyl with dark grey fabric grille.
Time-Energy-Frequency (TEF) Curves (250 Hz to 15 kHz). Front-back
span is from 8027 microseconds to 3027 microseconds; vertical divi-
sions 6 dB. 8330 Surround Foreground Music System
TOP VIEW
WALL MOUNTED
VIEW
BACK VIEW
FRONT VIEW
8500 Balboa Boulevard, P.O. Box 2200
Northridge, California 91329 U.S.A.
A Harman International Company
JBL Professional
SS 8330
CRP 5M
11/96