JBL Incorporated, 8500 Balboa Boulevard, P.O. Box 2200, Northridge, California 91329 U.S.A.
JBL3678
-LF
REV H
PACKAGE
WIRING DIAGRAM
09-03
Technical Manual
JBL3678-LF
SPECIFICATIONS
ACOUSTIC & ELECTRICAL SPECIFICATIONS:
• Nominal Impedance:
8 ohm
• Power Capacity:
300W (Passive) IEC Noise
HF: 50W
LF: 600W (Bi-Amp)
• Frequency Range:
30 Hz to 20 kHz (–10dB)
w/3678HF - Passive Mode
• Sensitivity:
98 dB SPL*
• Crossover Frequency:
1 kHz
SYSTEM COMPONENTS:
• Cabinet:
C3678
• Grille:
None
• Low Frequency
380mm (15 in.) Paper Cone
Transducer:
Transducer (2226HPL)
• DC Resistance:
5.0 ohm ±10% Aluminum Wire
*1 Watt (2.83 V RMS) @ 1 Meter
SYSTEM COMPONENTS:
(cont’d)
• Crossover Network:
N3678-LF (129-20015-00)
AURAL SWEEP TEST SPECIFICATIONS:
A. System Aural Sweep Test:
(w/3678HF Connected)
7.0V Input, 20 Hz to 20 kHz
(Passive Mode)
B. L.F. Aural Sweep Test:
10.0V Input, 20 Hz to 1.2 kHz
PHYSICAL SPECIFICATIONS:
• Enclosure Dimensions:
765mm x 651mm x 292mm D
(30.13 x 25.63 x 11.5 in. D)
• Shipping Weight:
98 lbs. (44 kg.)
WARRANTY INFORMATION:
• Refer to Warranty Statement packed with each product.
Warranty 59660
Literature 980-00018-00
Owners Manual 980-00023-00
Corner Pad (8)
991-00015-00
Microfoam (4)
74309
Carton
990-00165-00
SCHEMATIC N3678-LF (129-20015-00)
Speaker,
Low Freq
2226HPL
Cone Repl
C8R2226
ORN/BLK
GRN/BLK
GRN
+
LIN
–
LIN
–
HIN
+
HIN
ORN
YEL/BLK
YEL
*
JUMPERS
L3
2.0mH
L4
1.1mH
R4
2 6
R5
2 6
R6
2 6
R7
2 6
C4
4.5µF
R3
1 0
C2
10µF
C3
24µF
C1
2.5µF
C6
18µF
C5
26µF
L1
0.6mH
L2
3.9mH
GRN
T12
+
LOUT
T11
T10
T9
–
LOUT
T8
–
HOUT
T5
+
HOUT
T3
–
TOUT
+
TOUT
BUS WIRE
T7
T4
T6
WHT
INPUT
R1 1 6
WHT/
BLK
B1
B2
GRNBLK
NOTE: POSITIVE VOLTAGE TO NETWORK (
+
) INPUT PRODUCES FORWARD CONE MOVEMENT.
*
*
*
*
Network
N3678-LF
(129-20015-00)
SK3
2 Each
