JBL GT1500
Service Manual

GT1500 15" Woofer � Technical Data
SEALED BOX VOLUME VENTED BOX VOLUME

length = 10.86"

(2) Ports
fo = 30 Hz

GT1500
(side view)

GT1500
(side view)

VBOX = 2.50 ft3 (70.80 liters)
(all sides lined with 1-inch fiberglass or fiberfill)

VBOX = 4.00 ft3 (113.28 liters)
(all sides lined with 1-inch fiberglass or fiberfill)

diameter = 4.0"

SEALED FREQUENCY RESPONSE @ 2.83 V
100 dB In-Car 12 dB LP @ 65 Hz 105 95 Out-Of-Car 100

VENTED FREQUENCY RESPONSE @ 2.83 V
dB In-Car 12 dB LP @ 80 Hz

90

95

Out-Of-Car

85

90

80

85

75

80

70

75

65

70

60 20 Frequency 50 100 Hz 200 500 1k

C

65 20 Frequency 50 100 Hz 200 500 1k

C

2k

2k

SEALED EXCURSION/GROUP DELAY @ 200 W
20.0 Xd mM T mSec 20 17.5 15 17.5

VENTED EXCURSION/GROUP DELAY @ 250 W
20.0 Xd mM T mSec 20 15

15.0

10

15.0

10

12.5

Group Delay

5

12.5

Group Delay

5

10.0

0

10.0

0

7.5 Transducer Excursion 5.0

-5 -10

7.5 5.0 Transducer Excursion

-5 -10

2.5

-15

2.5

-15

0 20 Frequency 50 100 Hz 200 500 1k

C

-20

0 20 Frequency 50 100 Hz 200 500 1k

C

-20

2k

2k

JBL Technical Data . . . . . 7�27