JBL 3678-LF Technical Manual
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
J BL3678-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
R426R526R626R7
26
C4
4.5µF
R3
10
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 16
WHT/
BLK
B1
B2
GRNBLK
NOTE: POSITIVE V OLTAGE TO NETWORK (+) INPUT PRODUCES FORWARD CONE MOVEMENT.
*
*
*
*
Network
N3678-LF
(129-20015-00)
SK3
2 Each
JBL3678-LF
J B L3678-LF
COMPONENT EXPLODED VIEW
Speaker, Low Freq
2226HPL
Cone Repl
C8R2226
T-Nut (8)
61861
10-32
T-Nut
835-44061-00
5/16-18
Gasket
63285
Cabinet
C3678
Screw
902801-012
5/16-18 x 3/4
PH BLK
Gasket
359-00050-03
Label
73276S
Port Cover, Foam
382-00085-00
Port Tube (2)
331163-001
Screw (8)
804-01110-16
10-32 x 1
FIL, PH, BLK,
ZINC
Network
N3678-LF
129-20015-00
Screw (8)
882-41110-12
No.6
PH BLK
3678-LF NETWORK WIRING INSTRUCTIONS:
The internal network of the 3678-LF (low frequency section) can be used to operate the system in
either passive or bi-amplified mode.
The network comes pre-configured for passive
crossover operation, with four jumpers in
place, as shown:
To bypass the internal passive crossover network for bi-amplified operation, remove all four
jumpers and connect as shown:
Note that in both passive and bi-amplified mode, the same HF driver cable connection is made.
Cable
(Not Included)
256-00035-00
Jumpers
(4 Each)
63-0098-0000
from
amplifier
from HF
amplifier
from LF
amplifier
to HF Dr iver
to HF Dr iver
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