JBL Power P1220 II Handleiding
Lees hieronder de š handleiding in het Nederlandse voor JBL Power P1220 II (4 pagina's) in de categorie Subwoofer. Deze handleiding was nuttig voor 4 personen en werd door 2 gebruikers gemiddeld met 4.5 sterren beoordeeld
Pagina 1/4
Automotive Subwoofers Ownerās Manual P1020 II P1020D II P1220 II P1220D II
POWER SERIESĀ®
Ā®
Thank you for purchasing a new
JBL Power Series subwoofer.
Subwoofer installation requires
woodworking skills and some
experience 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 trafļ¬c.
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.
Power Series subwoofers are
optimized to perform best in small,
sealed, vented and prefabricated
bandpass enclosures. While
inļ¬nite-bafļ¬e mounting of
Power Series subs is possible,
power handling will be greatly
compromised because thereās no
enclosed volume of air to prevent
the speakerās cone from moving
past its limit. For this reason, we
do not recommend inļ¬nite-bafļ¬e
mounting for Power Series
subwoofers.
You should choose the enclosure
you will use based on the type of
music you listen to, how much
ampliļ¬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
wooferās 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, 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
efļ¬ciency in the 40Hz ā 50Hz range
but this efļ¬ciency comes at the
expense of sound in the lowest
octave (below 40Hz) and at the
expense of some control and power
handling. If you are using a small
ampliļ¬er, 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
speciļ¬c relationship with the
characteristics of the woofer, the
enclosure must be built exactly to
the speciļ¬cations provided. While
there are some prefabricated
vented boxes available, matching a
prefabricated box to a particular
woofer is difļ¬cult. 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 often
provide the most output available
from any ampliļ¬er and subwoofer
combination at the expense of
sonic accuracy. If sheer SPL
(sound-pressure level) is what you
desire most, choose a bandpass
enclosure. Bandpass-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 enclosure described in the
enclosure design sheet included
with this woofer. Fortunately, there
are many prefabricated bandpass
boxes available and they are all
optimized to extract the most
output possible from any woofer.
Bandpass enclosures can be quite
large and may require a lot of space
inside your vehicle.
02
Choosing an Enclosure JBL Power Series
03
JBL Power Series subwoofers
are available in two different
conļ¬gurations: as a single 2-ohm
voice coil or as dual 2-ohm voice
coils. Depending on the ampliļ¬ers
you are using, you may use either
single-voice coil or dual-voice coil
subwoofers in singles or multiples
to maximize the power available
from your ampliļ¬ers. To achieve
the maximum ampliļ¬er output
possible, you should design a
speaker system that provides
the lowest impedance that
your ampliļ¬er is rated to drive
safely. When designing a
subwoofer system, consider
the following rules:
1. Donāt mix different subwoofer
or enclosure types in the same
system (use all single-coil
woofers or all dual-coil woofers).
2. You may connect the coils of a
dual-voice coil woofer in series,
but we recommend that you
avoid connecting separate
woofers in series. Because the
ampliļ¬er-damping factor (the
ampliļ¬erās ability to control
the motion of the woofer) is
expressed as a ratio of terminal
impedance (the sum of speaker
impedance, wire resistance and
the D.C. resistance of any
crossover coil connected to the
woofer) to ampliļ¬er-output
impedance, connecting separate
woofers in series reduces the
damping factor of the ampliļ¬er
to a value less than 1. This will
result in poor transient response.
3. You must use both coils of a
dual-voice coil woofer connected
either in series or in parallel.
4. Most ampliļ¬ers deliver exactly
the same amount of power
bridged into a 4-ohm load
as they do running a 2-ohm
stereo load.
To design a subwoofer system
that maximizes available ampliļ¬er
power, keep the following rules
in mind:
1. The total system impedance of
woofers in parallel = 1/(1/w1+
1/w2+ 1/w3...), where w is the
nominal impedance of the
woofer.
2. The total system impedance
of voice coils (or woofers) in
series = w1+ w2+ w3...
The diagrams below and at right
show parallel and series speaker
connections.
Figure 1. Parallel connection
Figure 2. Series connection
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Connecting Your Subwoofer to Your Amplifier JBL Power Series
Product specificaties
| Merk: | JBL |
| Categorie: | Subwoofer |
| Model: | Power P1220 II |
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