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JBL CS1214 Manual

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CHOOSING AN ENCLOSURE
THANK YOU for purchasing
a JBL
®
CS Series subwoofer.
Subwoofer installation requires
woodworking skills and some
experience in disassembling and
reassembling automotive interiors.
If you lack the tools or necessary
skills, have your subwoofer installed
by an authorized JBL dealer.
WARNING: Playing loud music
in an automobile can permanently
damage your hearing as well as
hinder your ability to hear traffi c.
Listening at low levels while driving
is recommended. JBL, Inc., accepts
no liability for hearing loss, bodily
injury or property damage resulting
from use or misuse of this product.
CS Series subwoofers are optimized
to perform best in small, sealed,
vented and prefabricated band-
pass enclosures. While infi nite-
baffl e mounting of CS Series subs
is possible, power handling will
be greatly compromised because
there’s no enclosed volume of
air to prevent the speaker’s cone
from moving past its limit. For this
reason, infi nite-baffl e mounting is
not recommended for CS Series
subwoofers.
You should choose the enclosure
you will use based on the type
of music you listen to, how much
amplifi er 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 movement, a woofer
mounted in a sealed enclosure will
handle more power than a woofer
mounted in another enclosure type.
Sealed enclosures provide more-
accurate sonic reproduction than
other enclosure types when
mounted inside a vehicle, so they
are well suited to all types of music.
Sealed-enclosure 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 particular speaker, so they
require the smallest amount of
space inside the vehicle.
Vented enclosures provide better
effi ciency in the 40Hz – 50Hz range,
but this effi ciency comes at the
expense of sound in the lowest
octave (below 40Hz) and at the
expense of some control and power
handling at the lowest frequencies.
If you are using a small amplifi er,
a vented box will provide more
perceived 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 specifi c relationship with the
characteristics of the woofer, the
enclosure must be built exactly to
the specifi cations provided. While
there are some prefabricated
vented boxes available, matching
a prefabricated box to a particular
woofer is diffi cult. If you wish to
use a vented enclosure, it is strongly
recommended that you have your
authorized JBL dealer build it or
verify that your design is correct
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.
Band-pass enclosures often
provide the most output available
from any amplifi er and subwoofer
combination, at the expense of sonic
accuracy.
If sheer SPL (sound-pressure level)
is what you desire most, choose a
band-pass enclosure. Band-pass
enclosure design is very tricky, and
the aid of a computer and enclosure
design software is necessary. If you
are an experienced installer or have
some woodworking experience,
you may wish to build the band-
pass enclosure described in the
enclosure design sheet included
with this woofer. Fortunately, there
are many prefabricated band-pass
boxes
available, and they are all optimized
to extract the most output possible
from any woofer. Band-pass
enclosures can be quite large and
may require a lot of space inside
your vehicle.
0093CSK - JBL Car CS1014+CS1214 OM.indd 20093CSK - JBL Car CS1014+CS1214 OM.indd 2 05/01/09 9:12:3505/01/09 9:12:35
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