Használati útmutató JBL Grand Touring GT1041

JBL mélynyomó Grand Touring GT1041

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Oldal 1/4

Grand Touring®Series

GT1041, GT1041 , GT1081, GT1241, GT1241 , GT1281D D

Owner’s Manual

A U T O M O T I V E S U B W O O F E R S

S E R I E S

Thank you for purchasing a new

JBL GT Series subwoofer. Subwoofer

installation often requires woodworking

skills and some experience disassem-

bling and reassembling automotive inte-

riors. If you lack the tools or necessary

skills, have your subwoofer installed by

an authorized JBL dealer.

Warning: Playing loud music in an auto-

mobile can permanently damage your

hearing as well as hinder your ability to

hear trafﬁc. 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.

construction is straightforward and there

are many prefabricated sealed enclo-

sures available. An optimum sealed

enclosure is always smaller than other

types of enclosures optimized for a par-

ticular speaker, so they require the small-

est amount of space inside the vehicle.

Vented enclosures provide better efﬁ-

ciency in the 40Hz – 50Hz range, but this

efﬁciency 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

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 character-

istics of the woofer, the enclosure must

be built exactly to the speciﬁcations

provided. While there are some prefabri-

cated vented boxes available, matching a

prefabricated box to a particular woofer

is difﬁcult. If you wish to use a vented

enclosure, we strongly recommend

having your authorized JBL dealer build

Choosing an Enclosure

GT Series subwoofers are optimized to

perform best in small sealed, vented

and prefabricated bandpass enclosures.

While inﬁnite-bafﬂe mounting of

GT Series subs is possible, power

handling is greatly compromised

because there’s no enclosed volume of

air to prevent the speaker’s cone from

moving past its limit. For this reason,

we do not recommend inﬁnite-bafﬂe

mounting for GT Series subwoofers.

You should choose the enclosure you

will use based on the type of music you

listen to, how much ampliﬁer 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 woofer’s move-

ment, a woofer mounted in a sealed

enclosure can 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

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

ampliﬁer-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; using 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

Speciﬁcations

chart in

this manual. 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.

Connecting Your Subwoofer to Your

Ampliﬁer

JBL GT Series subwoofers are available

in three dierent conﬁgurations: single

4-ohm voice coil, single 8-ohm voice coil

and dual 4-ohm voice coils. Depending

on the ampliﬁer you are using, you may

use either single- or dual-voice-coil

subwoofers in singles or multiples to

maximize the power available from your

ampliﬁer. To achieve the maximum

ampliﬁer output possible, you should

design a speaker system that provides

the lowest impedance that your ampliﬁer

is rated to drive safely. When designing

a subwoofer system, abide by the

following rules:

1. Don’t mix dierent subwoofer or enclo-

sure types in the same system (use all

single-coil 4-ohm woofers, all single-

coil 8-ohm woofers, or all dual-coil

woofers).

2. You may connect the coils of a dual-

voice-coil woofer in series, but NEVER

connect separate woofers in series.

Because the ampliﬁer-damping factor

(the ampliﬁer’s 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 ampliﬁer-output imped-

ance, connecting woofers in series

reduces the damping factor of the

ampliﬁer 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 either in series or in

parallel.

4. Most ampliﬁers 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 ampliﬁer 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 imped-

ance of the woofer.

2. The total system impedance of voice

coils (or woofers) in series = w

1 +

w2 + w3...

The diagrams below and at right show

parallel and series speaker connections.

Figure 1. Parallel connection

Figure 2. Series connection

Termékspecifikációk

Márka:	JBL
Kategória:	mélynyomó
Modell:	Grand Touring GT1041

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