JBL GT1500 Instruction manual

SPECIFICATIONS
DIAMETER: 15" (381.0 MM)
SENSITIVITY (2.83 V @ 1 M): 97 dB
POWER HANDLING: 300 WRMS
FREQUENCY RESPONSE: 20 ~ 2,000 HZ
NOMINAL IMPEDANCE:4OHMS
VOICE-COIL DIAMETER: 2.0" (50.7 MM)
DIMENSIONS:
THIELE-SMALL PARAMETERS
VOICE COIL DCRESISTANCE:R
EVC (OHMS) . . . . . . 3.25
VOICE COIL INDUCTANCE @ 1 KHZ:L
EVC (MH). . . . . . . . 1.99
DRIVER RADIATING AREA:S
D(IN2) . . . . . . . 131.94
SD(CM2). . . . . . . 855.00
MOTOR FORCE FACTOR:BL(TM) . . . . . . . . 11.16
COMPLIANCE VOLUME:V
AS (FT3). . . . . . . . 19.67
VAS (LITERS). . . . . 463.93
SUSPENSION COMPLIANCE:C
MS (µM/N) . . . . 446.91
MOVING MASS, AIR LOAD:M
MS (GRAMS) . . . . 127.79
MOVING MASS, DIAPHRAGM:M
MD (GRAMS). . . . 113.42
FREE-AIR RESONANCE:F
S(HZ) . . . . . . . . 21.06
MECHANICAL Q: QMS . . . . . . . . . . . . 8.90
ELECTRICAL Q: QES . . . . . . . . . . . . 0.44
TOTAL Q: QTS . . . . . . . . . . . . 0.42
MAGNETIC-GAP HEIGHT:H
AG (IN) . . . . . . . . . 0.31
HAG (MM) . . . . . . . . 7.92
VOICE-COIL HEIGHT:H
VC (IN) . . . . . . . . . 0.67
HVC (MM) . . . . . . . 17.04
MAXIMUM EXCURSION:X
MAX (IN) . . . . . . . . 0.18
XMAX (MM). . . . . . . . 4.56
IMPEDANCE CURVE
INFINITE BAFFLE
FREQUENCY RESPONSE @ 2.83 V
INFINITE BAFFLE
EXCURSION/GROUP DELAY @ 40 W
GT1500 15" Woofer – Technical Data
7•26 . . . . . JBL Technical Data
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 2k
Out-Of-Car
In-Car
12 dB LP @ 60 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 2k
Transducer Excursion
Group Delay
mounting depth
6.69" (170.00 mm)
cutout diameter
13.94" (355.00 mm)
outer diameter
15.13" (384.18 mm)

VBOX = 2.50 ft3 (70.80 liters)
(all sides lined with 1-inch fiberglass or fiberfill)
GT1500
(side view)
C
dB
100
95
90
85
80
75
70
65
60
20 Frequency 50 100 Hz 200 500 1k 2k
Out-Of-Car
In-Car
12 dB LP @ 65 Hz
C
Xd mM
20.0
17.5
15.0
12.5
10.0
7.5
5.0
2.5
0
T mSec 20
15
10
5
0
-5
-10
-15
-20
20 Frequency 50 100 Hz 200 500 1k 2k
Transducer Excursion
Group Delay
GT1500
(side view)
(2) Ports
fo= 30 Hz
diameter = 4.0"
length = 10.86"
VBOX = 4.00 ft3 (113.28 liters)
(all sides lined with 1-inch fiberglass or fiberfill)
C
dB
105
100
95
90
85
80
75
70
65
20 Frequency 50 100 Hz 200 500 1k 2k
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 20
15
10
5
0
-5
-10
-15
-20
20 Frequency 50 100 Hz 200 500 1k 2k
Transducer Excursion
Group Delay
SEALED
BOX VOLUME
SEALED
FREQUENCY RESPONSE @ 2.83 V
SEALED
EXCURSION/GROUP DELAY @ 200 W
VENTED
BOX VOLUME
VENTED
FREQUENCY RESPONSE @ 2.83 V
VENTED
EXCURSION/GROUP DELAY @ 250 W
GT1500 15" Woofer – Technical Data
JBL Technical Data . . . . . 7•27

SEALED BANDPASS
BOX VOLUME
SEALED BANDPASS
FREQUENCY RESPONSE @ 2.83 V
SEALED BANDPASS
EXCURSION/GROUP DELAY @ 200 W
NOTES
GT1500 15" Woofer – Technical Data
7•28 . . . . . JBL Technical Data
VREAR = 2.50 ft3 (70.80 liters)
(all sides lined with 1-inch fiberglass or fiberfill)
VFRONT = 1.75 ft3
(49.56 liters)
GT1500
(side view)
diam. = 4"
(2)Ports
fo= 60 Hz
length =
5.45"
C
dB
105
100
95
90
85
80
75
70
65
20 Frequency 50 100 Hz 200 500 1k 2k
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 2k
Transducer Excursion
Group Delay