JBL 1200 GTI User Manual
SPECIFICATIONS
DIAMETER: 12" (0.47 MM)
S
ENSITIVITY (2.83 V @ 1 M): 93 dB
P
OWER HANDLING: 600 W
RMS
FREQUENCY RESPONSE: 20 ~ 300 HZ
NOMINAL IMPEDANCE:4 OHMS
VOICE-COIL DIAMETER: 4.0" (102.0 MM)
D
IMENSIONS:
THIELE-SMALL PARAMETERS
VOICE COIL DC RESISTANCE:R
EVC
(OHMS) . . . . . . 2.50
V
OICE COIL INDUCTANCE @ 1 KHZ:L
EVC
(MH). . . . . . . . 0.98
D
RIVER RADIATING AREA:S
D
(IN2) . . . . . . . . 84.57
S
D
(CM2). . . . . . . 548.00
M
OTOR FORCE FACTOR:BL (TM) . . . . . . . . 12.48
C
OMPLIANCE VOLUME:V
AS
(FT3). . . . . . . . . 2.40
V
AS
(LITERS). . . . . . 56.66
S
USPENSION COMPLIANCE:C
MS
(µM/N) . . . . 132.87
M
OVING MASS, AIR LOAD:M
MS
(GRAMS) . . . . 139.26
M
OVING MASS, DIAPHRAGM:M
MD
(GRAMS). . . . 131.88
F
REE-AIR RESONANCE:F
S
(HZ) . . . . . . . . 37.00
M
ECHANICAL Q: Q
MS
. . . . . . . . . . . . 4.89
E
LECTRICAL Q: Q
ES
. . . . . . . . . . . . 0.52
T
OTAL Q: Q
TS
. . . . . . . . . . . . 0.47
M
AGNETIC-GAP HEIGHT:H
AG
(IN) . . . . . . . . . 0.32
H
AG
(MM) . . . . . . . . 8.12
V
OICE-COIL HEIGHT:H
VC
(IN) . . . . . . . . . 0.75
H
VC
(MM) . . . . . . . 19.05
M
AXIMUM EXCURSION:X
MAX
(IN) . . . . . . . . 0.22
X
MAX
(MM). . . . . . . . 5.46
IMPEDANCE CURVE
INFINITE BAFFLE
FREQUENCY RESPONSE @ 2.83 V
INFINITE BAFFLE
EXCURSION/GROUP DELAY @ 150 W
1200GTi 12" Woofer – Technical Data
7•50 . . . . . JBL Technical Data
mounting depth
4.25" (107.95 mm)
cutout diameter
11.19" (284.16 mm)
outer diameter
12.19" (309.56 mm)
Ohms
100.0
1.0
3.0
10.0
30.0
20 Frequency 50 100 Hz 200 500 1k 2k
C
dB
100
95
90
85
80
75
70
65
60
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
T mSec
10.0
7.5
5.0
2.5
0.0
-2.5
-5.0
-7.5
-10.0
20 Frequency 50 100 Hz 200 500 1k 2 k
Transducer Excursion
Group Delay
GTi1200
(side view)
Port
fo = 31 Hz
diameter = 4.0"
length = 8.36"
V
BOX
= 2.50 ft3 (70.80 liters)
(all sides lined with 1-inch fiberglass or fiberfill)
C
dB
110
105
100
95
90
85
80
75
70
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
T mSec
10.0
7.5
5.0
2.5
0.0
-2.5
-5.0
-7.5
-10.0
20 Frequency 50 100 Hz 200 500 1k 2 k
Transducer Excursion
Group Delay
V
BOX
= 1.35 ft3 (38.23 liters)
(all sides lined with 1-inch fiberglass or fiberfill)
GTi1200
(side view)
C
dB
100
95
90
85
80
75
70
65
60
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
T mSec
10.0
7.5
5.0
2.5
0.0
-2.5
-5.0
-7.5
-10.0
20 Frequency 50 100 Hz 200 500 1k 2 k
Transducer Excursion
Group Delay
SEALED
BOX VOLUME
SEALED
FREQUENCY RESPONSE @ 2.83 V
SEALED
EXCURSION/GROUP DELAY @ 300 W
VENTED
BOX VOLUME
VENTED
FREQUENCY RESPONSE @ 2.83 V
VENTED
EXCURSION/GROUP DELAY @ 300 W
1200GTi 12" Woofer – Technical Data
JBL Technical Data . . . . . 7•51
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