JBL 4428 Technical Manual
4428
JBL Consumer Products, 250 Crossways Park Drive, Woodbury, New York 11797
Legend on Page 2
28
27
(2)
.250
.205
LF INPUT
L3
.14mH
L2
1.0mH
LP2
8ohm
7W
LP1
8ohm
7W
L1
5.0mH
L2
1.0mH
C5
2uf
100V
.110
L.F.
U.H.F.
C1
22uf
100V
R5
1.2ohm
5W
R6
10ohm
5W
+
—
.205
C4
1.0uf
100V
CROSSOVER
NETWORK
351410-001
CROSSOVER NETWORK
351410-002
HIGH-FREQUENCY
TRANSDUCER
339811-001
UHF TRANSDUCER
351265-001
LOW-FREQUENCY
TRANSDUCER
339200-002
GRN
GRN/BLK
RED
RED/BLK
R/W
BLK/WHT
ORN/BLK
ORN
L1
0.1mH
C1
5.1uf
100V
.250
H.F.
R1
7.5ohm
10W
R2
4.7ohm
10W
R3
4.7ohm
10W
R4
4.7ohm
5W
+
—
.205
YEL
YEL/BLK
BLK
RED
BLK/WHT
RED/WHT
GRN/BLK
GRN
ORN/BLK
ORN
YEL/BLK
YEL
C2
10uf
100V
C3
5.1uf
100V
PACKAGING
4428 WIRING DIAGRAM
4428 SCHEMATIC
Technical Manual
4428
ACOUSTIC & ELECTRICAL SPECIFICATIONS:
•Nominal Impedance 8 ohms
• Max Amp Power 200 watts*
•Frequency Response 40Hz – 40kHz (–6dB)
• Sensitivity 91dB (2.83V @ 1 meter)
•Crossover Frequencies 900Hz, 7kHz
SYSTEM COMPONENTS:
• Cabinet 4428 (not for sale)
• Grille 351440-001
• UHF Transducer 7/8" (22mm) 015M
351265-001
DC Resistance 6.7 ohms ±10%
• High-Frequency Transducer 1-3/4" (44.4mm) 175Nd-2
339811-001
DC Resistance 3.7 ohms ±10%
• Low-Frequency Transducer 12" (305mm) 1200FE-8
339200-002
DC Resistance 5.6 ohms ±10%
•Crossover Network – LF 351410-002
HF/UHF w/L-Pad 351410-001
AURAL SWEEP TEST SPECIFICATIONS:
• System Aural Sweep Test 6.0V Input 40Hz to 20kHz
• L.F. Aural Sweep Test 6.0V Input 20Hz to 1.5kHz
• H.F. Aural Sweep Test 2.83V Input 500Hz to 8kHz
• U.H.F. Aural Sweep Test 1.0V Input 5kHz to 20kHz
PHYSICAL SPECIFICATIONS:
• Enclosure dimensions 25" x 16" x 12-1/2"
(H x W x D) (plus 1" for horn mouth)
(635mm x 406mm x 318mm)
•Weight 71 lb (32.3kg) each
WARRANTY:
• Refer to Warranty Statement packed with each product.
* The maximum recommended amplifier power rating will
ensure proper system headroom to allow for occasional
peaks. We do not recommend sustained operation at these
maximum power levels.
®
Rev1 9/2003
19
4428 Cabinet – Not for sale
(1)
(4)
(4)
(2)
(8)
20
24
6223
1 16 15
23
21
11
10 1813 4
817 2614
12
5
(2)
2 19
(4)
72919
(4)
92524
(18)
(6)
(6)
(6)
(3) (4)
4428
JBL Consumer Products, 250 Crossways Park Drive, Woodbury, New York 11797
Rev1 9/2003
ITEM
NO. DESCRIPTION QTY. PART NO.
1. Horn, HF/UHF, Pntd-4428 1 351489-001
2. Network, HF/UHF, W/L-Pad-4428 1 351410-001
3. Asy, Wfr-1200FE-8 1 339200-002
4. Asy , Tweeter, XDCR-175ND-2 1 339811-001
5. PTB, Crdbd, 2.5x4.75, 1/16THK-4425MKII 2 47909-55
6. Cup, Grl-Hls/Studio II Ser 4 333249-001
7. Cup, Term-4428 1 351441-001
8. Gskt, Drv, 12"-PMTS 1 335481-001
9. Network, LF-4428 1 351410-002
10. Asy , Twtr-UHF-015M 1 351265-001
11. Horn, HF, Rear, Pntd-4348 1 339092-001
12. Nameplate-4428 1 351491-001
13. Gskt, Horn, Throat, HF-4348 1 339702-001
14. Grl, Frnt, Cab-4428 1 351440-001
15. Gskt, UHF, Chipbd-4428 1 351858-001
16. Gskt, Horn-4428 1 351359-001
17. Screw (woofer to enclosure) 8 804-01110-24
10-32 X 1-1/2, FIL, PH, BLK ZINC, LCS
18. Screw (UHF/horn) 4 802-93056-06
6-32 X 3/8, BTN, HEX, NO FIN, SS
ITEM
NO. DESCRIPTION QTY. PART NO.
EXPLODED VIEW
Technical Manual
4428
®
TO SERVICE THE 4428:
Remove the woofer; crossover network(s) and all drivers must be accessed through the woofer opening in the cabinet.
If L-Pad removal is necessary, the three screws for removal are located beneath the Level Control label. If the label
cannot be salvaged after removal, order part# 351442-001.
19. Screw (T Cup/HF Ntwk/Tie Wrap) 9 61867
#6 X 3/4, OVHDPH
20. Screw (horn/cab) 6 874-33114-20
10-32 X 1-1/4, SOC CAP, BLK ZINC, ALLOY
21. Screw (horn-frnt to rear) 2 804-41110-20
10-32 X 1-1/4, PAN, PH, BLK ZINC, LCS
22. Screw (l-pad/cab) 3 803-11010-32
8-32 X 2", FLT, PH, CLR ZINC, LCS
23. Bolt (drvr/rear horn) 4 854-03001-12
1/4-20 X 3/4, CAP, CLR ZINC, MCS
24. Washer (horn/cab) #10, Type A, ZINC PL 24 843-00100-05
25. Screw (LF ntwk) 6 883-41110-16
8-32 X 1, PAN, PH, PB, BLK ZINC, LCS
26. Level Control (L-Pad) Label 1 351442-001
27. Outer Carton 1 351490-001
28. Top-Bottom Pads 2 351443-001
29. Shorting Straps (set R-L) 1 CS06-6
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