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Decade Series subwoofers are optimized
to perform best in small sealed, vented
and prefabricated bandpass enclosures.
While infinite-baffle mounting of Decade
Series subs is possible, power handling
will be greatly compromised since there
will be no enclosed volume of air to 
prevent the speaker ’s cone from mount-
ing past its limit. For this reason, we do
not recommend infinite-baffle mounting
for Decade Series subwoofers.

You should choose the enclosure you will
use based on the type of music you listen
to, how much amplifier power you will
use for the subwoofer, and how much
space inside the vehicle you can devote
to a subwoofer enclosure.

Because a sealed enclosure provides the
most control over the woofer ’s move-
ment, a woofer mounted in a sealed
enclosure will handle more power than a
woofer mounted in a different kind of
enclosure. Sealed enclosures provide
more accurate sonic reproduction than
other enclosure types, so they are well-
suited to all types of music. Sealed enclo-
sure construction is straightforward, and
there are many prefabricated sealed
enclosures available. An optimum sealed
enclosure is always smaller than other
types of enclosures optimized for a par-
ticular speaker, so they require the small-
est amount of space inside the vehicle.

Vented enclosures provide better 
efficiency in the 40Hz – 50Hz range, but
this efficiency comes at the expense of
sound in the lowest octave (below 40Hz)
and at the expense of some control and
power handling. If you are using a small
amplifier, a vented box will provide more
bass output from less power. Vented
enclosures are also well-suited to a 
variety of music types. Because vented
enclosures require the volume of the
enclosure and the size of the port to have
a specific relationship with the character-
istics of the woofer, the enclosure must
be built exactly to the specifications pro-
vided. While there are some prefabricated
vented boxes available, matching a 
prefabricated vented box to a particular
woofer is difficult. If you wish to use a
vented enclosure, we strongly recom-
mend having your authorized JBL dealer
build it, or verify that your design is cor-
rect if you wish to build it yourself. An
optimum vented enclosure is always 
larger than the optimum sealed box for
the same woofer, and will require more
space inside the vehicle.

Bandpass enclosures often provide the
greatest output available from any ampli -
fier and subwoofer combination at the
expense of sonic accuracy. If sheer SPL
(sound-pressure level) is what you desire
most, choose a bandpass enclosure.
Bandpass enclosure design is very tric ky
and the aid of a computer and enclosure-
design software is essential. If you are an
experienced installer or have some wood -
working experience, you may wish to
build the enclosure described in the
Specifications chart in this manual.
Fortunately, there are many prefabricated
bandpass boxes available, and they are
all optimized to extract the greatest out-
put possible from any woofer. Bandpass
enclosures can be quite large, and may
require a lot of space inside your vehicle.

for purchasing a new JBL

Decade™ Series subwoofer. Subwoofer
installation often requires woodworking
skills and some experience disassembling
and reassembling automotive interiors. If
you lack the tools or skills necessary,
have your subwoofer installed by an
authorized JBLdealer.

Warning: Playing loud music in an auto -
mobile can permanently damage your
hearing as well as hinder your ability to
hear traffic. We recommend listening at
low levels while in your car. JBL accepts
no liability for hearing loss, bodily injury
or property damage resulting from use or
misuse of this product.

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Recommended Amplifier Power Range:

18 – 175W

18 – 225W

Sensitivity:

92dB

93dB

Frequency Response:

38Hz – 800Hz

38Hz – 500Hz

Mounting Depth:

4-9/16" (116mm)

5" (127mm)

Cut-Out Diameter:

9" (229mm)

10-7/8" (277mm)

Nominal Impedance:

4 ohms

4 ohms

Revc:

3.52 ohms

3.45 ohms

Fs:

29.5Hz

27.4Hz

Vas:

71 liters

109 liters

Qms:

4.39

3.18

Qes:

0.29

0.37

Qts:

0.268

0.33

Mms:

74.99g

109.23g

Levc:

2.02mH

2.23mH

Enclosure Volume:

1 cu. ft. (28.31 liters)

1.25 cu. ft. (35.88 liters)

Enclosure Volume:

1.5 cu. ft. (42.46 liters)

1.75 cu. ft. (49.54 liters)

Port Diameter:

3" (76.2mm)

4" (101.6mm)

Port Length:

7" (177.8mm)

10-3/4" (273mm)

Sealed-Chamber Volume:

1 cu. ft. (28.31 liters)

1.25 cu. ft. (35.88 liters)

Vented-Chamber Volume:                                 .7 cu. ft. (19.82 liters)

1 cu. ft. (28.31 liters)

Port Diameter:

4" (101.6mm)

4" (101.6mm)

Port Length:

8" (203.2mm)

6" (152.4mm)

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JBLConsumer Products
250 Crossways Park Drive

Woodbury, NY 11797

www.jbl.com

Part No. DS105/125OM  

Made in China

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