Infinity Kappa 100.9w, Kappa 120.9w Brochure & Specs
KAP PA
®
100.9w
120.9w
KAP PA
®
2
THANK YOU
for choosing an
Infinity
®
Kappa®Series 100.9w or 120.9w
subwoofer.These Kappa subwoofers are
designed to suit a broad range of car audio
applications and can be used in a wide
variety of enclosure types to produce
extended,powerful bass in a limited
amount of vehicle space.To get the most
performance from your new subwoofer,
it is strongly recommended that you have
a qualified professional install your 100.9w
or 120.9w subwoofer. Although this manual
does provide general instructions about
installing these Kappa Series subwoofers,
it does not include enclosure construction
details or exact installation methods for
any particular vehicle.If you do not feel
that you have the necessary experience,
do not attempt the installation yourself,but
instead ask your authorized Infinity dealer
about professional installation options.
Remember to keep your sales receipt in a
safe place, along with this manual, so that
both are available for future reference.
BOX CONTENTS
(1) 100.9w or 120.9w subwoofer
(1) Foam mounting gasket
(1) 3mm hex wrench
(1) Owner’s manual
(1) Technical data sheet
WARNING
Playing loud music in a vehicle can hinder
your ability to hear traffic and permanently
damage your hearing.The maximum volume
levels achievable by Infinity speakers when
combined with high-power amplification
may exceed safe levels for extended
listening.Using low volume levels is
recommended when driving. Infinity
Systems accepts no liability for hearing
loss, bodily injury,or property damage as
a result of use or misuse of this product.
REPRODUCING
BASS IN VEHICLES
Depending on the size of your vehicle’s
interior listening space,reproduced bass
frequencies below 80Hz will be boosted
by nearly 12dB per octave as frequency
decreases.This phenomenon, known as the
vehicle’s transfer function (or cabin gain),
plays an important role in shaping the
subwoofer’s frequency response in your
vehicle.The enclosed technical data sheet
includes frequency response graphs that
show both the subwoofer’s “in-car”
response (which factors in this vehicle
transfer function) and its “out-of-car”
response (which does not).
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SUBWOOFER
ENCLOSURE TYPES
Kappa 100.9w and 120.9w subwoofers are
designed to perform best in moderately
sized sealed enclosures, vented enclosures
and prefabricated band-pass enclosures.
Infinite-baffle mounting is possible,but the
subwoofer’s mechanical power handling will
be reduced because there will be no volume
of air to stiffen the subwoofer’s suspension
and prevent overexcursion.If you choose
infinite-baffle mounting,consider the RMS
and peak power-handling ratings to be half
of what is listed in the specifications in
this manual.
You should choose an enclosure type
based on the amount of cargo space you
can devote to the enclosure, the amount
of power you will use to drive your
subwoofer(s), and your listening habits.
SEALED ENCLOSURES
The air trapped inside a sealed enclosure
is compressed when the subwoofer
moves rearward and is rarefied when the
subwoofer moves forward.In both cases,
the air inside and outside the box will
seek equilibrium by pushing and pulling
on the subwoofer cone.The result is a
stiffer suspension when compared to the
subwoofer operating in free air.This means
that the subwoofer’s cone will be harder
to move at low frequencies, a condition
which protects the subwoofer from
physical overexcursion,but requires more
power than other designs to achieve a
given acoustic output.
See accompanying data sheet for specific
enclosure dimension requirements.
SEALED-ENCLOSURE PERFORMANCE ADVANTAGES
• The in-vehicle performance will have
the flattest overall frequency response.
• The in-vehicle response will have the
widest bandwidth. (Usable low-frequency
response inside the vehicle will be
below 20Hz.)
• An optimum sealed enclosure will always
be smaller than an optimum enclosure of
another type.
SEALED-ENCLOSURE PERFORMANCE TRADE-OFFS
• An optimum sealed enclosure will have
lower overall efficiency than an optimum
enclosure of another type.
• A 100.9w or 120.9w subwoofer in an
optimum sealed enclosure will require
more amplifier power to achieve a given
acoustic output than in an optimum
enclosure of another type.
SEALED-ENCLOSURE CONSTRUCTION
Sealed-enclosure construction is straightforward and forgiving of errors in volume
calculation,but air leaks should be avoided.
Use medium-density fiberboard (MDF), glue
and screws to construct the enclosure,and
seal all joints with silicone caulk.
THE INFINITY RECOMMENDATION
100.9w and 120.9w subwoofers in sealed
enclosures are recommended for enthusiasts who prefer accurate music reproduction and flat frequency response,for those
who have a smaller space to devote to a
subwoofer enclosure,and for those who
have plenty of amplifier power devoted to
driving the subwoofer.The sealed-enclosure
design indicated on the technical data sheet
accompanying this manual represents the
best compromise between low-frequency
extension and flat response.
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