JBL 1200.4 GTi Service Tips ▷ View online
SPECIFICATIONS
D
IAMETER
:
12" (0.47
MM
)
S
ENSITIVITY
(2.83 V @ 1
M
):
93 dB
P
OWER
H
ANDLING
:
600 W
RMS
F
REQUENCY
R
ESPONSE
:
20 ~ 300 H
Z
N
OMINAL
I
MPEDANCE
:
4
OHMS
V
OICE
-C
OIL
D
IAMETER
:
4.0" (102.0
MM
)
D
IMENSIONS
:
THIELE-SMALL PARAMETERS
V
OICE
C
OIL
D
C
R
ESISTANCE
:
R
EVC
(
OHMS
) . . . . . . 2.50
V
OICE
C
OIL
I
NDUCTANCE
@ 1
K
H
Z
: L
EVC
(
M
H). . . . . . . . 0.98
D
RIVER
R
ADIATING
A
REA
:
S
D
(
IN
2
) . . . . . . . . 84.57
S
D
(
CM
2
). . . . . . . 548.00
M
OTOR
F
ORCE
F
ACTOR
:
B
L
(T
M
) . . . . . . . . 12.48
C
OMPLIANCE
V
OLUME
:
V
AS
(
FT
3
). . . . . . . . . 2.40
V
AS
(
LITERS
). . . . . . 56.66
S
USPENSION
C
OMPLIANCE
:
C
MS
(µ
M
/N) . . . . 132.87
M
OVING
M
ASS
, A
IR
L
OAD
:
M
MS
(
GRAMS
) . . . . 139.26
M
OVING
M
ASS
, D
IAPHRAGM
:
M
MD
(
GRAMS
). . . . 131.88
F
REE
-A
IR
R
ESONANCE
:
F
S
(H
Z
) . . . . . . . . 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
-G
AP
H
EIGHT
:
H
AG
(
IN
) . . . . . . . . . 0.32
H
AG
(
MM
) . . . . . . . . 8.12
V
OICE
-C
OIL
H
EIGHT
:
H
VC
(
IN
) . . . . . . . . . 0.75
H
VC
(
MM
) . . . . . . . 19.05
M
AXIMUM
E
XCURSION
:
X
MAX
(
IN
) . . . . . . . . 0.22
X
MAX
(
MM
). . . . . . . . 5.46
IMPEDANCE CURVE
INFINITE BAFFLE
FREQUENCY RESPONSE @ 2.83 V
FREQUENCY RESPONSE @ 2.83 V
INFINITE BAFFLE
EXCURSION/GROUP DELAY @ 150 W
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
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 ft
3
(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
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 ft
3
(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
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
BOX VOLUME
SEALED
FREQUENCY RESPONSE @ 2.83 V
FREQUENCY RESPONSE @ 2.83 V
SEALED
EXCURSION/GROUP DELAY @ 300 W
EXCURSION/GROUP DELAY @ 300 W
VENTED
BOX VOLUME
BOX VOLUME
VENTED
FREQUENCY RESPONSE @ 2.83 V
FREQUENCY RESPONSE @ 2.83 V
VENTED
EXCURSION/GROUP DELAY @ 300 W
EXCURSION/GROUP DELAY @ 300 W
1200GTi 12" Woofer – Technical Data
JBL Technical Data . . . . . 7•51
SEALED BANDPASS
BOX VOLUME
BOX VOLUME
SEALED BANDPASS
FREQUENCY RESPONSE @ 2.83 V
FREQUENCY RESPONSE @ 2.83 V
SEALED BANDPASS
EXCURSION/GROUP DELAY @ 500 W
EXCURSION/GROUP DELAY @ 500 W
NOTES
1200GTi 12" Woofer – Technical Data
7•52 . . . . . JBL Technical Data
V
REAR
=
1.35 ft
3
(38.23 liters)
(all sides lined with 1-inch fiberglass or fiberfill)
V
FRONT
=
0.50 ft
3
(14.16 liters)
GTi1200
(side view)
diam. = 4"
Port
fo= 65 Hz
length =
12.61"
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
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
100
75
50
25
0
-25
-50
-75
-100
20 Frequency 50 100 Hz 200 500 1k 2 k
Transducer Excursion
Group Delay
Display
