JBL GT1200 User Manual

SPECIFICATIONS
DIAMETER: 12" (304.8 MM)
S
ENSITIVITY (2.83 V @ 1 M): 95 dB
P
OWER HANDLING: 280 W
RMS
FREQUENCY RESPONSE: 25 ~ 3,000 HZ
NOMINAL IMPEDANCE:4 OHMS
VOICE-COIL DIAMETER: 2.0" (50.7 MM)
D
IMENSIONS:
THIELE-SMALL PARAMETERS
VOICE COIL DC RESISTANCE:R
EVC
(OHMS) . . . . . . 3.17
V
OICE COIL INDUCTANCE @ 1 KHZ:L
EVC
(MH). . . . . . . . 2.16
D
RIVER RADIATING AREA:S
D
(IN
2
) . . . . . . . . 82.10
S
D
(CM
2
). . . . . . . 532.00
M
OTOR FORCE FACTOR:BL (TM) . . . . . . . . 12.82
C
OMPLIANCE VOLUME:V
AS
(FT
3
). . . . . . . . . 6.60
V
AS
(LITERS). . . . . 155.73
S
USPENSION COMPLIANCE:C
MS
(µM/N) . . . . 387.48
M
OVING MASS, AIR LOAD:M
MS
(GRAMS) . . . . 105.69
MOVING MASS, DIAPHRAGM:M
MD
(GRAMS). . . . . 98.64
F
REE-AIR RESONANCE:F
S
(HZ) . . . . . . . . 24.80
M
ECHANICAL Q: Q
MS
. . . . . . . . . . . 11.76
E
LECTRICAL Q: Q
ES
. . . . . . . . . . . . 0.32
T
OTAL Q: Q
TS
. . . . . . . . . . . . 0.31
M
AGNETIC-GAP HEIGHT:H
AG
(IN) . . . . . . . . . 0.31
H
AG
(MM) . . . . . . . . 7.92
V
OICE-COIL HEIGHT:H
VC
(IN) . . . . . . . . . 0.88
H
VC
(MM) . . . . . . . 22.23
M
AXIMUM EXCURSION:X
MAX
(IN) . . . . . . . . .0.28
X
MAX
(MM). . . . . . . . 7.15
IMPEDANCE CURVE
INFINITE BAFFLE
FREQUENCY RESPONSE @ 2.83 V
INFINITE BAFFLE
EXCURSION/GROUP DELAY @ 75 W
GT1200 12" Woofer – Technical Data
7•20 . . . . . 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
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 @ 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
mounting depth
5.75" (146.05 mm)
cutout diameter
11.13" (283.00 mm)
outer diameter
12.18" (309.44 mm)

JBL GT1200 Specifications

General

Brand	JBL
Model	GT1200
Category	Subwoofer
Language	English

Summary

Speaker Specifications

General Specifications

Details on diameter, sensitivity, power handling, frequency response, nominal impedance, and voice-coil diameter.

Physical Dimensions

Provides mounting depth, cutout diameter, and outer diameter measurements for the speaker.

Impedance and Response Curves

Impedance Curve

Graphical representation of the speaker's impedance across frequency.

Infinite Baffle Frequency Response

Shows frequency response in both In-Car and Out-Of-Car conditions.

Infinite Baffle Excursion/Group Delay

Illustrates transducer excursion and group delay at 75W.

Thiele-Small Parameters

Electrical and Mechanical Parameters

Lists parameters like REVC, Levc, BL, VAS, CMS, MMS, QMS, QES, QTS.

Voice Coil and Excursion Data

Details voice coil height, magnetic gap height, and maximum excursion (XMAX).

Box Volume Recommendations

Sealed Box Volume

Recommended sealed enclosure volume and construction details.

Vented Box Volume

Recommended vented enclosure volume, port dimensions, and tuning frequency.

Boxed Performance Curves

Sealed Box Frequency Response

Frequency response for the speaker in a sealed enclosure.

Sealed Box Excursion/Group Delay

Excursion and group delay for the speaker in a sealed enclosure at 250W.

Vented Box Frequency Response

Frequency response for the speaker in a vented enclosure.

Vented Box Excursion/Group Delay

Excursion and group delay for the speaker in a vented enclosure at 275W.

Sealed Bandpass Enclosure Data

Sealed Bandpass Box Volume

Details on sealed bandpass enclosure volume and port tuning.

Sealed Bandpass Frequency Response

Frequency response for the speaker in a sealed bandpass enclosure.

Sealed Bandpass Excursion/Group Delay

Excursion and group delay for the speaker in a sealed bandpass enclosure at 200W.