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SPECIFICATIONS

D

IAMETER

:

12" (304.8 

MM

)

S

ENSITIVITY

(2.83 V @ 1

M

):

93 dB

P

OWER

H

ANDLING

:

250 W

RMS

(1,000 W

PEAK

)

F

REQUENCY

R

ESPONSE

:

23 ~ 450 H

Z

N

OMINAL

I

MPEDANCE

:

OHMS

V

OICE

-C

OIL

D

IAMETER

:

2.0" (50.8 

MM

)

D

IMENSIONS

:

THIELE-SMALL PARAMETERS

V

OICE

C

OIL

D

C

R

ESISTANCE

:

R

EVC

(

OHMS

) . . . . . . 3.56

V

OICE

C

OIL

I

NDUCTANCE

@ 1 

K

H

Z

: L

EVC

(

M

H) . . . . . . . 2.54

D

RIVER

R

ADIATING

A

REA

:

S

D

(

IN

2

) . . . . . . . . 82.31

S

D

(

CM

2

) . . . . . . 531.00

M

OTOR

F

ORCE

F

ACTOR

:

B

L

(T

M

) . . . . . . . . 14.78

C

OMPLIANCE

V

OLUME

:

V

AS

(

FT

3

) . . . . . . . . 3.22

V

AS

(

LITERS

) . . . . . 91.12

S

USPENSION

C

OMPLIANCE

:

C

MS

M

/N) . . . . 227.58

M

OVING

M

ASS

, A

IR

L

OAD

:

M

MS

(

GRAMS

). . . . 181.74

M

OVING

M

ASS

, D

IAPHRAGM

:

M

MD

(

GRAMS

) . . . 174.70

F

REE

-A

IR

R

ESONANCE

:

F

S

(H

Z

) . . . . . . . . 24.75

M

ECHANICAL

Q:

Q

MS

. . . . . . . . . . . 6.46

E

LECTRICAL

Q:

Q

ES

. . . . . . . . . . . . 0.46

T

OTAL

Q:

Q

TS

. . . . . . . . . . . . 0.43

M

AGNETIC

-G

AP

H

EIGHT

:

H

AG

(

IN

) . . . . . . . . . 1.30

H

AG

(

MM

) . . . . . . . 33.00

V

OICE

-C

OIL

H

EIGHT

:

H

VC

(

IN

) . . . . . . . . . 0.31

H

VC

(

MM

) . . . . . . . . 8.00

M

AXIMUM

E

XCURSION

:

X

MAX

(

IN

) . . . . . . . . 0.49

X

MAX

(

MM

) . . . . . . 12.50

SEALED BOX VOLUME 
(INCLUDES DRIVER DISPLACEMENT)

SEALED
FREQUENCY RESPONSE @ 2.83 V

SEALED 
TRANSDUCER EXCURSION @ 300 W

JBL Consumer Products  •  250 Crossways Park Drive  •  Woodbury, NY 11797  •  VOICE: 516-496-3400  •  FAX: 516-496-4868  •  www.jbl.com

GT120 12" Woofer – Technical Data

mounting depth

6.25" (158.75 mm)

cutout diameter

11.125" (283.00 mm)

outer diameter

12.25" (311.15 mm)

V

BOX

 = 

 

1.00 ft

(28.32 liters)

(stuffed with loosely-packed fiberfill)

GT120

(side view)

C

dB    

 100

   90

   80

   70

   60

   50

   40

   30

   20

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

20       Frequency       50                      100 Hz                200                              500                      1k                      2 k    

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