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Cinema
Professional Series
Key Features:
Frequency Range: 34 Hz to 20 kHz
Sensitivity: 100 dB 1 watt, 1 meter
(3.3 ft)
Power Capacity: 600 watt
continuous IEC pink noise
Components:
Dual 380 mm (15 in) low
frequency loudspeakers
100 mm (4 in) compression
driver
90° x 40° Constant-Coverage
Bi-Radial® horn
Selectable crossover adjustment for
the proper alignment of 2360 Series
Bi-Radial
Simple field assembly reduces
labor costs
The JBL 4675C provides powerful,
smooth and accurate reproduction
of motion picture soundtracks in
medium and large cinemas. The system is comprised of two parts: the
4675D-HF high frequency pack and
the 4638TH low frequency system.
The 4675C-HF high frequency pack
features the JBL 2446H, 100 mm (4 in)
diaphragm compression driver, JBL
2360A Bi-Radial
fully adjustable bracket. The large for-
mat Bi-Radial
dispersion of the high frequency information throughout both the vertical
and horizontal coverage angles.
The 4638TH employs the latest in JBL
low frequency transducer technology
offering exceptional performance benefits. The JBL 2035H 380 mm (15 in)
transducer employs a copper-sleeved
magnetic pole piece providing a sta-
bilized magnetic field which provides
lower 2nd and 3rd order harmonic
distortion and flat power response.
The copper-sleeved pole piece
reduces flux modulation and acts as
a shorted turn causing the impedance
curve to flatten at higher frequencies.
This helps in maintaining a smooth
transition between the low and high
frequency devices in the crossover
region producing, among other things,
accurate reproduction of dialog
throughout the entire listening area.
®
horns
®
horn and JBL 2506B
®
horn ensures uniform
4675C
Loudspeaker System
Specifications:
SYSTEM ELEMENTS:
1-JBL 4675C-HF
1-IBL 4638TH
SYSTEM SPECIFICATIONS:
Frequency range (-10 dB): 34 Hz - 20 kHz
Frequency response ( ± 3 dB): 40 Hz - 16 kHz
Power capacity’: 600 W continuous pink noise
Sensitivity: 100 dB 1 W (2.83 V) 1 m (3.3 ft)
Nominal impedance: 4 ohms
Crossover frequency: 630 Hz
Nominal coverage: 90° horizontal, 40° vertical
Half-space reference efficiency: 6.3%
Maximum continuous acoustical power
High frequency output connector:
4638TH LOW FREQUENCY SYSTEM:
4675C-HF HIGH FREQUENCY SYSTEM:
¹Rating based on test signal of filtered random noise conforming to the international standard IEC 268-l (pink noise with
12 dB per octave rollof below 40 Hz and above 5000 Hz with a peak-to-average ratio of 6 dB), two hours duration
JBL continually engages in research related to produce improvement. New materials, production methods, and design
refinements are introduced into existing products without notice as a routine expression on 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 other wise stated.
output (sine wave input): 28 acoustic watts
System polarity: Positive voltage to red terminal produces forward
Input connector: Color-coded push terminals
Net system weight: 66.2 kg (146 lb)
Shipping weight: 68 kg (150 lb)
Dimensions: 991 mm x 648 mm x 451 mm
H x W x D
Net system weight: 43.6 kg (96 lb)
Shipping weight: 48.2 kg (100 lb)
Dimensions: 940 mm x 795 mm x 795 mm
H x W x D
cone motion
Color-coded push terminals
2-2035HPL 380 mm (15 in) low frequency
transducers
1-4508A LF enclosure
1-N4638 network
(39 in x 25½ in x 17¾ in)
1-2360A Bi-Radial horn
1-2446H
1-2506B Adjustable bracket
(37 in x 31 in x 31 in)
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4675C Cinema Loudspeaker System
The JBL 4638TH utilizes a new 600 watt IEC pink noise
rated crossover which features Constant-Coverage horn
equalization for both 2380A and 2360A Series Bi-Radial
horns. The enclosure is constructed of dense stock and
is extensively braced on all panels reducing cabinet
resonances. Net internal volume is 2251(8 cu ft) and
the enclosure is tuned to 40 Hz with large port tubes,
ensuring minimum turbulence at full power input at
low frequencies.
®
JBL Professional
8500 Balboa Boulevard, P.O. Box 2200
Northridge, California 91329 U.S.A.
A Harman International Company
SS 4675C
CRP 5M
10/96
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