Subwoofer Enclosure Types - Infinity Kappa 100.9w Brochure & Specs

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.
S E
EALED NCLOSURES
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.
S -E P A
EALED NCLOSURE ERFORMANCE DVANTAGES
• 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.
S -E P T -O
EALED NCLOSURE ERFORMANCE RADE FFS
• 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.
S -E C
EALED NCLOSURE ONSTRUCTION
Sealed-enclosure construction is straight-
forward 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.
T I R
HE NFINITY ECOMMENDATION
100.9w and 120.9w subwoofers in sealed
enclosures are recommended for enthusi-
asts who prefer accurate music reproduc-
tion 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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