JBL W12GTi Käyttöohje

JBL Subwoofer W12GTi

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PRO POWER
TM
Automotive Subwoofer Owner’s Manual W10GTi W12GTi W15GTi
Thank you for choosing a JBL GTi Series
subwoofer. GTi Series subwoofers are
designed to provide maximum sound
output in a variety of enclosure types
while maintaining the superb sound quality
associated with JBL. To ensure the best
subwoofer performance, we strongly
recommend that installation be entrusted
to a qualified professional. Although
these instructions explain how to install a
GTi Series subwoofer in a general sense,
they don’t show the specific installation
procedures that may be required for your
particular vehicle. If you feel you don’t have
the necessary tools or experience, don’t
attempt the installation yourself; rather,
ask your authorized JBL dealer about
professional-installation options.
Warning: Playing loud music in an
automobile can hinder your ability to hear
traffic, as well as permanently damage your
hearing. We recommend listening at low
levels while driving. JBL accepts no liability
for hearing loss, bodily injury or property
damage resulting from use or misuse of
this product.
Your Car and Bass Reproduction
Depending on the size of the vehicles
interior listening space, reproduced
frequencies below 80Hz may be boosted
by nearly 12dB per octave as frequency
decreases. This effect, commonly known
as transfer function or cabin gain, plays
an important role in defining the in-car
frequency response of your subwoofer.
It is displayed graphically, along with
freespace response, on the enclosed
data sheet for your GTi subwoofer.
Power-Handling Limitations
The power-handling capacity of any
subwoofer is related to the excursion
limit of its suspension and its ability to
dissipate heat. A speaker reaches its
excursion-limited power-handling capacity
when its suspension is stretched to its
limit. The excursion curve shown on the
Enclosure Design Sheet (included with
your woofer) displays cone excursion at
the input power level required to drive
the woofer to maximum linear excursion
(Xmax). The input power shown may
be used as instantaneous input only.
Thermal power handling is determined by
the amount of heat that may be dissipated
by the driver s voice coil. The power-
handling rating assigned to your GTi Series
subwoofer is its thermal-power-handling
rating. This rating assumes a clean
(unclipped) signal. A clipped waveform
has much higher average power, due to
the longer duty cycle at the top and bottom
of the waveform; it will heat the woofers
voice coil faster than a clean signal and
may damage the voice coil. A square wave
has a 100% duty cycle and is extremely
dangerous for any speaker. Audible
distortion in the output of your woofer
is an indication that your amplifier may
be clipping, which could damage your
speakers over time.
02
The Official Brand of Live Music
Choosing an Enclosure
GTi Series subwoofers are optimized to
perform best in small sealed, vented and
bandpass enclosures. While infinite-baffle
mounting of GTi Series subs is possible,
power handling will be compromised since
there will be no enclosed volume of air
to help the speakers suspension control
the motion of the woofers cone. For this
reason, we do not recommend infinite-
baffle mounting for high-power applications.
You should choose the enclosure you ll use
based on the type of music you listen to,
how much amplifier power you ll use to
drive the subwoofer, and how much space
inside the vehicle you can devote to a
subwoofer enclosure. If you ll be using your
GTi Series subwoofer for SPL competition,
please see the document titled GTi as SPL
Competition Subwoofers (included with
your woofer).
Because a sealed enclosure provides the
most control over the woofer s movement, a
woofer mounted in a sealed enclosure will
handle more power at low frequencies than
a woofer mounted in another enclosure
type. Sealed enclosures provide more
accurate sonic reproduction than other
enclosure types, so they are well suited
to all types of music. Sealed-enclosure
construction is straightforward. An
optimum sealed enclosure is always smaller
than other types of enclosures that are
optimized for a particular speaker, so they
require the least space inside the vehicle.
Vented enclosures provide better efficiency
in the 40Hz 60Hz range, but this
efficiency comes at the expense of sound
output in the lowest octave (below 40Hz)
and at the expense of some control and
power handling below box tuning. 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
characteristics of the woofer, the enclosure
must be built exactly to the specifications
provided. If you wish to use a vented
enclosure, we strongly recommend having
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.
Bandpass enclosures can provide the
greatest output available from any amplifier
and subwoofer combination at the
expense of sonic accuracy. If sheer SPL
(sound pressure level) is what you desire
most, choose a vented or bandpass
enclosure. Bandpass enclosure design is
very tricky and the aid of a computer and
enclosure design software is necessary if
you wish to design the enclosure yourself.
Like a vented enclosure, a bandpass
enclosure must be built exactly to the
specifications provided. Bandpass
enclosures can be quite large and may
require a lot of space inside your vehicle.
03
PRO POWER
TM

Tuotetiedot

Merkki: JBL
Kategoria: Subwoofer
Malli: W12GTi

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