Page 1
SPECIFICATIONS
DIAMETER: 12" (304.8 MM)
S
ENSITIVITY (2.83 V @ 1 M): 93 dB
P
OWER HANDLING: 250 W
RMS
(1,000 W
PEAK
)
F
REQUENCY
RESPONSE: 23 ~ 450 HZ
NOMINAL
IMPEDANCE:4 OHMS
VOICE-COIL DIAMETER: 2.0" (50.8 MM)
D
IMENSIONS
:
THIELE-SMALL PARAMETERS
VOICE COIL DC RESISTANCE:R
EVC
(OHMS) . . . . . . 3.56
V
OICE COIL INDUCTANCE @ 1 KHZ:L
EVC
(MH) . . . . . . . 2.54
D
RIVER RADIATING
AREA:S
D
(
IN
2
) . . . . . . . . 82.31
S
D
(CM2) . . . . . . 531.00
M
OTOR FORCE FACTOR:BL (TM) . . . . . . . . 14.78
C
OMPLIANCE VOLUME:V
AS
(FT3) . . . . . . . . 3.22
V
AS
(LITERS) . . . . . 91.12
S
USPENSION COMPLIANCE:C
MS
(µM/N) . . . . 227.58
M
OVING MASS, AIR LOAD:M
MS
(GRAMS). . . . 181.74
MOVING MASS, DIAPHRAGM:M
MD
(GRAMS) . . . 174.70
F
REE-AIR RESONANCE:F
S
(HZ) . . . . . . . . 24.75
M
ECHANICAL Q: Q
MS
. . . . . . . . . . . 6.46
E
LECTRICAL Q: Q
ES
. . . . . . . . . . . . 0.46
T
OTAL Q: Q
TS
. . . . . . . . . . . . 0.43
M
AGNETIC-GAP HEIGHT:H
AG
(IN) . . . . . . . . . 1.30
H
AG
(MM) . . . . . . . 33.00
V
OICE-COIL HEIGHT:H
VC
(IN) . . . . . . . . . 0.31
H
VC
(MM) . . . . . . . . 8.00
M
AXIMUM EXCURSION:X
MAX
(IN) . . . . . . . . 0.49
X
MAX
(MM) . . . . . . 12.50
SEALED BOX VOLUME
(INCLUDES DRIVER DISPLACEMENT)
SEALED
FREQUENCY RESPONSE @ 2.83 V
SEALED
TRANSDUCER EXCURSION @ 300 W
JBL Consumer Products • 250 Crossways Park Drive • Woodbury, NY 11797 • VOICE: 516-496-3400 • FAX: 516-496-4868 • www.jbl.com
GT120 12" Woofer – Technical Data
mounting depth
6.25" (158.75 mm)
cutout diameter
11.125" (283.00 mm)
outer diameter
12.25" (311.15 mm)
V
BOX
= 1.00 ft3 (28.32 liters)
(stuffed with loosely-packed fiberfill)
GT120
(side view)
C
dB
100
90
80
70
60
50
40
30
20
20 Frequency 50 100 Hz 200 500 1k 2 k
Out-Of-Car
In-Car
12 dB LP @ 80 Hz
C
Xd mM
20.0
17.5
15.0
12.5
10.0
7.5
5.0
2.5
0.0
20 Frequency 50 100 Hz 200 500 1k 2 k
Page 2
VENTED BOX VOLUME
(INCLUDES DRIVER/PORT DISPLACEMENTS)
VENTED
FREQUENCY RESPONSE @ 2.83 V
VENTED
TRANSDUCER EXCURSION @ 300 W
SEALED BANDPASS BOX VOLUME
(INCLUDES DRIVER/PORT DISPLACEMENTS
)
SEALED BANDPASS
FREQUENCY RESPONSE @ 2.83 V
SEALED BANDPASS
TRANSDUCER EXCURSION @ 300 W
JBL Consumer Products • 250 Crossways Park Drive • Woodbury, NY 11797 • VOICE: 516-496-3400 • FAX: 516-496-4868 • www.jbl.com
GT120 12" Woofer – Technical Data
GT120
(side view)
Port
fo = 30.0 Hz
diameter = 4"
length = 13.31"
V
BOX
= 2.25 ft3 (63.72 liters)
(no fiberfill)
C
dB
110
100
90
80
70
60
50
40
30
20 Frequency 50 100 Hz 200 500 1k 2 k
Out-Of-Car
In-Car
12 dB LP @ 80 Hz
C
Xd mM
40
35
30
25
20
15
10
5
0
20 Frequency 50 100 Hz 200 500 1k 2 k
V
FRONT =
2.00 ft
3
(56.64 liters)
(stuffed with loosely-packed
fiberfill)
diam. = 6"
Port
fo= 45.0 Hz
length =
10.57"
V
REAR
= 1.50 ft3 (42.48 liters)
(stuffed with loosely-packed fiberfill)
GT120
(side view)
C
dB
110
100
90
80
70
60
50
40
30
20 Frequency 50 100 Hz 200 500 1k 2 k
Out-Of-Car
In-Car
12 dB LP @ 80 Hz
C
Xd mM
20 Frequency 50 100 Hz 200 500 1k 2 k
20.0
17.5
15.0
12.5
10.0
7.5
5.0
2.5
0.0
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