JBL 3678-LF Technical Manual

Technical Manual
JBL3678-LF

SPECIFICATIONS

ACOUSTIC & ELECTRICAL SPECIFICATIONS:
• Nominal Impedance:
• Power Capacity:
• Frequency Range:
• Sensitivity:
• Crossover Frequency:

SYSTEM COMPONENTS:

• Cabinet:
• Grille:
• Low Frequency
Transducer:
• DC Resistance:
*1 Watt (2.83 V RMS) @ 1 Meter
PACKAGE
Warranty 59660
Literature 980-00018-00
Owners Manual 980-00023-00
JBL Incorporated, 8500 Balboa Boulevard, P.O. Box 2200, Northridge, California 91329 U.S.A.
8 ohm
300W (Passive) IEC Noise
HF: 50W
LF: 600W (Bi-Amp)
30 Hz to 20 kHz (–10dB)
w/3678HF - Passive Mode
98 dB SPL*
1 kHz
C3678
None
380mm (15 in.) Paper Cone
Transducer (2226HPL)
5.0 ohm ±10% Aluminum Wire
Corner Pad (8)
991-00015-00
Microfoam (4)
74309
Carton
990-00165-00
SYSTEM COMPONENTS:
• Crossover Network:

AURAL SWEEP TEST SPECIFICATIONS:

A. System Aural Sweep Test:
B. L.F. Aural Sweep Test:

PHYSICAL SPECIFICATIONS:

• Enclosure Dimensions:
• Shipping Weight:

WARRANTY INFORMATION:

• Refer to Warranty Statement packed with each product.

WIRING DIAGRAM

Speaker,
Low Freq
2226HPL
Cone Repl
C8R2226
GRN/BLK
SCHEMATIC N3678-LF (129-20015-00)
L3
WHT
2.0mH
C5
26µF
INPUT
WHT/
BLK
R1 1 6
C1
2.5µF
B1
B2
SK3
2 Each
NOTE: POSITIVE VOLTAGE TO NETWORK (
(cont'd)
N3678-LF (129-20015-00)
(w/3678HF Connected)
7.0V Input, 20 Hz to 20 kHz
(Passive Mode)
10.0V Input, 20 Hz to 1.2 kHz
765mm x 651mm x 292mm D
(30.13 x 25.63 x 11.5 in. D)
98 lbs. (44 kg.)
Network
GRN
N3678-LF
(129-20015-00)
ORN/BLK
L4
1.1mH
C6
18µF
+
R4 R5 R6 R7 –
LIN
2 6 2 6 2 6 2 6
ORN
C2
10µF
YEL/BLK
C3
C4
24µF
4.5µF
+
HIN
L2
3.9mH
L1
0.6mH
–
HIN
R3
1 0
YEL
*
JUMPERS
+
) INPUT PRODUCES FORWARD CONE MOVEMENT.
+
T12 LOUT
*
GRNBLK
T11
LIN
GRN
T10
*
–
T9 LOUT
–
T8 HOUT
*
–
TOUT
T7 T3
BUS WIRE
T6 T4
+
TOUT
*
+
T5 HOUT
09-03