Page 1
SPECIFICATIONS
DIAMETER: 18" (0.71 MM)
S
ENSITIVITY (2.83 V @ 1 M): 95 dB
P
OWER HANDLING: 600 W
RMS
FREQUENCY RESPONSE: 20 ~ 300 HZ
NOMINAL IMPEDANCE:4 OHMS
VOICE-COIL DIAMETER: 4.0" (102 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) . . . . . . . 195.99
S
D
(CM2). . . . . . 1270.00
M
OTOR FORCE FACTOR:BL (TM) . . . . . . . . 13.51
C
OMPLIANCE VOLUME:V
AS
(FT3). . . . . . . . 15.37
V
AS
(LITERS). . . . . 362.61
S
USPENSION COMPLIANCE:C
MS
(µM/N) . . . . 158.32
M
OVING MASS, AIR LOAD:M
MS
(GRAMS) . . . . 177.77
M
OVING MASS, DIAPHRAGM:M
MD
(GRAMS). . . . 151.75
F
REE-AIR RESONANCE:F
S
(HZ) . . . . . . . . 30.00
M
ECHANICAL Q: Q
MS
. . . . . . . . . . . . 6.77
E
LECTRICAL Q: Q
ES
. . . . . . . . . . . . 0.46
T
OTAL Q: Q
TS
. . . . . . . . . . . . 0.43
M
AGNETIC-GAP HEIGHT:H
AG
(IN) . . . . . . . . . 0.32
H
AG
(MM) . . . . . . . . 8.13
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
1800GTi18" Woofer – Technical Data
7•56 . . . . . JBL Technical Data
mounting depth
6.81" (173.04 mm)
cutout diameter
16.88" (428.63 mm)
outer diameter
18.25" (463.55 mm)
Ohms
100.0
1.0
3.0
10.0
30.0
20 Frequency 50 100 Hz 200 500 1k 2k
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 @ 70 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
Page 2
GTi1800
(side view)
(3) Ports
fo = 28 Hz
diameter = 4.0"
length = 5.47"
V
BOX
= 11.90 ft3 (337.01 liters)
(all sides lined with 1-inch fiberglass or fiberfill)
C
dB
115
110
105
100
95
90
85
80
75
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
T mSec
40
30
20
10
0
-10
-20
-30
-40
20 Frequency 50 100 Hz 200 500 1k 2 k
Transducer Excursion
Group Delay
V
BOX
= 6.50 ft3 (184.08 liters)
(all sides lined with 1-inch fiberglass or fiberfill)
GTi1800
(side view)
C
dB
105
100
95
90
85
80
75
70
65
20 Frequency 50 100 Hz 200 500 1k 2 k
Out-Of-Car
In-Car
12 dB LP @ 70 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
SEALED
BOX VOLUME
SEALED
FREQUENCY RESPONSE @ 2.83 V
SEALED
EXCURSION/GROUP DELAY @ 600 W
VENTED
BOX VOLUME
VENTED
FREQUENCY RESPONSE @ 2.83 V
VENTED
EXCURSION/GROUP DELAY @ 600 W
1800GTi18" Woofer – Technical Data
JBL Technical Data . . . . . 7•57
Page 3
SEALED BANDPASS
BOX VOLUME
SEALED BANDPASS
FREQUENCY RESPONSE @ 2.83 V
SEALED BANDPASS
EXCURSION/GROUP DELAY @ 600 W
NOTES
1800GTi18" Woofer – Technical Data
7•58 . . . . . JBL Technical Data
V
REAR
= 6.50 ft3 (184.08 liters)
(all sides lined with 1-inch fiberglass or fiberfill)
GTi1800
(side view)
V
FRONT =
2.20 ft
3
(62.30 liters)
(all sides lined with 1-inch
fiberglass or fiberfill)
diam. = 4"
length =
9.11"
(3) Ports
fo= 55 Hz
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
0.0
T mSec
40
30
20
10
0
-10
-20
-30
-40
20 Frequency 50 100 Hz 200 500 1k 2 k
Transducer Excursion
Group Delay
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