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JL AUDIO 12TW3-D4 / 12TW3-D8 3
All specifications are subject to change without notice.
SUBWOOFER RECOMMENDED SEALED ENCLOSURE
Volume
(net int.)
External Dimensions
(Width x Height x Depth)
F3
(Hz)
Fc
(Hz)
Qtc
12TW3-D4
0.80 ft
3
22.7 liters
21.25 in x 16 in x 6.5 in
540 mm x 406 mm x 165 mm
37.99 46.97 0.9426
12TW3-D8
1.00 ft
3
28.3 liters
25 in x 16.625 in x 6.5 in
635 mm x 422 mm x 165 mm
38.27 48.50 0.9919
SUBWOOFER RECOMMENDED PORTED ENCLOSURE
Volume
(net int.)
Enclosure External Dimensions
(Width x Height x Depth)
Slot Port Internal Dimensions
(Slot Width x Slot Height x Slot Length)
Tune to:
(Hz)
F3
(Hz)
12TW3-D4
0.95 ft
3
26.9 liters
30 in x 16.625 in x 6.5 in
762 mm x 422 mm x 165 mm
5 in x 2.5 in x 31.25 in
127 mm x 64 mm x 794 mm
32.14 32.52
12TW3-D8
1.3 ft
3
36.8 liters
34 in x 17 in x 6.75 in
864 mm x 432 mm x 171 mm
5.25 in x 2.375 in x 24 in
133 mm x 60 mm x 610 mm
31.00 29.79
• The enclosure recommendations listed are external
dimensions which assume the use of 3/4" (19mm)
thick material. If you are using 5/8" (16mm) thick
material, subtract 1/4" (6.5mm) from each dimension.
Do not use any material with a thickness of less than
5/8" (16mm) as this may compromise the rigidity of
the enclosure.
• Enclosure volumes listed are net internal volumes!
Box volume displacement, port displacement and
brace displacement must be added to obtain the
final gross internal volume. All enclosure dimensions
listed have already taken this into account.
• When using two subwoofers in a common
enclosure simply double the required volume.
• We recommend the use of this speaker in a bi-amplified
system using high-quality satellite speakers and
amplifiers. We do not recommend the use of this
subwoofer with a passive crossover (coil), as this type of
device will adversely affect performance.
W
H
D
SW
SH
PL
Port Wall Length:
12TW3-D4: 26 in (660 mm)
12TW3-D8: 22.0625 in (560 mm)
(End correction accounted for)
Prolonged exposure to sound pressure levels in excess of 100dB can cause permanent hearing loss. This high-performance
speaker can exceed this level. Please exercise restraint in its operation in order to preserve your ability to enjoy its fidelity.
When installing a subwoofer in your vehicle, it is extremely important to secure the enclosure firmly. We recommend
bolting the enclosure through the metal of the floorpan or the frame of the vehicle with large diameter washers
for reinforcement. If an enclosure is not firmly attached, it can become a projectile in a collision. This is particularly
important in a hatchback, station wagon, sports utility vehicle, or van.
!!
CAUTION
!!
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