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REFERENCE
®
1000s
1200s
REFERENCE
®
THANKYOU for choosing an Infinity
®
Reference
®
Series 1000s or 1200s
subwoofer. These Reference 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 1000s or 1200s subwoofer.
Although this manual does provide general
instructions about installing these
Reference 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) 1000s or 1200s subwoofer
(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.
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 1000s or 1200s 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 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.
THE INFINITY RECOMMENDATION
1000s and 1200s subwoofers in sealed
enclosures are recommended for
enthusiasts 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.
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).
SUBWOOFER
ENCLOSURE TYPES
Reference 1000s and 1200s 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-han-
dling 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 y
our
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
EN
REFERENCE
®
VENTED ENCLOSURES
A vented enclosure acts like a sealed
enclosure at frequencies above its tuned
(resonance) frequency. At resonance
(which is defined by the vent), the vent
produces the majority of sound – the
subwoofer cone is nearly stationary while
the air inside the vent vibrates. This
provides greater mechanical power
handling at and above resonance, but
reduced mechanical power handling below
resonance. Since the subwoofer cone and
voice coil don’t move much at resonance,
airflow across the voice coil is minimized
and thermal power handling is reduced
slightly at resonance.
Vented enclosures provide better
efficiency in the 40Hz – 60Hz range, at
the expense of sound output in the lowest
octave (below 40Hz). The use of an
infrasonic filter is recommended with
vented enclosures. An optimum vented
enclosure for a Reference Series
subwoofer is larger than an optimum
sealed enclosure.
See accompan
ying data sheet for specific
enclosure dimension requirements.
VENTED-ENCLOSURE PERFORMANCE
ADVANTAGES
• An optimum vented enclosure has
greater efficiency and higher output in
the 40Hz – 60Hz range than an optimum
sealed enclosure.
• An optimum vented enclosure provides a
greater sensation of bass than an
optimum sealed enclosure.
• A 1000s or 1200s subwoofer in an
optimum vented enclosure will require
less amplifier power to achieve a given
acoustic output (down to the
enclosure’s resonance frequency) than
in an optimum sealed enclosure.
BAND-PASS ENCLOSURES
Band-pass enclosures can provide the
most output from any amplifier and
subwoofer combination over a limited
band of frequencies, but that additional
output comes at the expense of sonic
accuracy. Band-pass enclosures combine
a sealed or vented enclosure that houses
the subwoofer along with a vented
chamber in
to which the subwoofer
outputs its sound. The vented chamber
acts as an acoustic low-pass filter which
attenuates high frequencies in the
subwoofer’s output. That attenuation of
high frequencies can make it very
difficult to hear amplifier and speaker
distortion; consequently, you may not be
able to determine when the subwoofer is
in danger of being damaged.
See accompanying data sheet for specific
enclosure dimension requirements.
BAND-PASS-ENCLOSURE PERFORMANCE
ADVANTAGES
• An optimum band-pass enclosure
provides higher output over a limited
bandwidth than an optimum enclosure of
any other type.
BAND-PASS-ENCLOSURE PERFORMANCE
TRADE-OFFS
• Band-pass enclosures achieve high
output at the expense of sonic
accuracy.
• An optimum band-pass enclosure has a
more limited bandwidth than an
optimum enclosure of any other type.
• The enclosure’s lo
w-pass filter
characteristics can make it difficult to
hear if the subwoofer is in danger of
being damaged.
• An optimum band-pass enclosure is
usually larger than an optimum vented
enclosure.
BAND-PASS-ENCLOSURE CONSTRUCTION
Band-pass-enclosure construction is more
difficult than vented-box construction
and, as with vented enclosures, the
design parameters for the vented section
must be followed carefully. (The sealed
section is more forgiving of small design
and construction variations.) Fortunately,
there are many prefabricated band-pass
enclosures that are designed to extract
the most output possible from nearly any
subwoofer. Prefabricated band-pass
enclosures are strongly recommended if
you must have a band-pass enclosure. If
you choose to build your own band-pass
enclosure, use medium-density fiberboard
(MDF), glue and screws to construct the
enclosure,and be sure to seal all joints
w
ith silicone caulk.
THE INFINITY RECOMMENDATION
Band-pass enclosures are recommended
only for enthusiasts who want high
sound-pressure levels (SPL) without
regard for sonic accuracy. If high SPL
AND great-sounding bass are your goals,
choosing a vented enclosure is
recommended instead.
VENTED-ENCLOSURE PERFORMANCE
TRADE-OFFS
• Reduced output in the lowest octave
(below 40Hz).
• Reduced mechanical power handling
below the enclosure’s resonance
frequency. The use of an electronic
infrasonic filter is strongly recommend-
ed, to reduce the chance of overdriving
the subwoofer below the enclosure’s
resonance frequency.
• An optimum vented enclosure will
always be larger than an optimum
sealed enclosure.
VENTED-ENCLOSURE CONSTRUCTION
Vented-enclosure construction is more
difficult than the construction of a sealed
enclosure. The enclosure volume and port
dimensions have a specific relationship
with the physical and electromechanical
characteristics of the subwoofer,
requiring tha
t the recommended
enclosure volume and port characteris-
tics be strictly observed. As with sealed
enclosures, use medium-density
fiberboard (MDF), glue and screws to
construct the enclosure, and seal all
joints with silicone caulk.
THE INFINITY RECOMMENDATION
1000s and 1200s subwoofers in vented
enclosures are recommended for
enthusiasts who prefer accentuated bass
response, for those who have plenty of
cargo space to devote to a subwoofer
enclosure and for those who will use a
less powerful amplifier to drive their
subwoofer. The volume and port
dimensions indicated on the included
technical data sheet must be followed
precisely to ensure optimum
performance.
EN
Produktspecifikationer
| Varumärke: | Infinity |
| Kategori: | Subwoofer |
| Modell: | Reference 1200S |
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