JBL 4800 Manuale utente

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JBL SERIES LOUDSPEAKERS INSTRUCTION MANUAL

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lntroduction

Congratulations on choosing JBL

loudspeakers. Their highly accurate,

uncolored and balanced sound character

will greatly increase your enjoyment of

recorded music. JBL speakers a¡e built

with careful attention to detail, using only

the highest quality materials. They will

provide many years of excellent perform-

ance.

The JBL Series is the result ofconcen-

trated efforts to combine traditional JBL

performance values with elegant

contemporary appearance at affordable

prices. Some ofthe engineering features

of the JBL Series are:

l) High output levels. This means that

modest amplifiers or receivers will be

able to produce acoustical levels normally

associated with amplifiers with substan-

tially more iated power.

2) Smooth, extended response. The JBL

Series 12 mm pure titanium dome tweeter,

polymer laminated cone drivers and

carefully designed dividing network

deliver clear, crisp, quality sound.

3) Accurate time/phase response.

Speakers in the JBL Series exhibit the

same precise "tum-on, tum-offl' charac-

teristics of JBL's larger home and studio

loudspeaker systems. This means more

accurate realization of the high frequency

detail in today's digital recordings.

4) Accurate stereo imaging. The in-line

component afrays on the baffle ensure the

best possible stereo imaging for listeners

both on axis and off.

.\!

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Placement For the best stereo reproduction, the two

loudspeaker systems should be placed an

equal distance from your listening

position and separated so that the angle

between them, at the listening position, is

between 40 and 60 degrees (see Fig. 1).

For example, if your listening position is

8 to 12 feet (2.5 to 4.5 m) from each

speaker, the two systems should be about

8 feet (2.5 m) apart.

Placing the loudspeakers in comers or

against a wall will result in the strongest

(but.not necessarily the most aocurate),

bass. Compact systems will also benefit

from placement on stands or shelves. For

the best stereo imaging, we recommend

that the systems be placed so that the high

frequency transducers are as close as

possible to the ear level of a seated

Iistener. Every room is different-and

there a¡e.different tastes. Sodonrt .

hesitate to experiment on your own.

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Connections

To connect the loudspeaker systems to

the receiver or amplifier, use two:'

conductor insulated wire. Your JBL

dealer'ca¡ recommend suitable cables; or

you can buy wire at most hardware stores.

We recommend #18 AWG (1 mm

diameter) wire as a minimum size. If

your speakers are more than 30 feet

(10 m) from your receiver or amplifier,

use larger diameter wire. Connections are

made at the terminals located on the back

of the loudspeaker.system, near the

bottom edge. The terminals accept bare

wire or banana plugs, either of which will

provide easy, secure connections. To

prepare the wire, strip approximately

U}-inch(l3 mm)of insulation. Each

conductor is made up of fine strands of

wire; twist the strands together. Push

down on the button below the terminal

and insert the wire through the hole

(see Fig. 2).

For each channel, the red terminal on the

loudspeaker should be connected to the

red or (+) loudspeaker connection

terminal on the receiver or amplifier.

The black terminal on the loudspeaker

should be connected to the black or (-)

loudspeaker connection terminal on the

receiver or amplifier.. .Connecting the

loudspeakers in this manner ensures that

they will be in phase; that is, work

together rather than in opposition.

Connecting the loudspeakers out ofphase

will not damage them, but will result in

less bass and poor imaging. Most two-

conductor wire is color coded, or has a

ridge on one of its insulating jackets, so

that you can easily identify which wire is

connected to which terminal (Fig. 2).

Fig.2

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iGeneral Care

The grille is held in place by pins near the

edges. To remove the grille, grasp it by

both top and bottom edges and pull

gently. To replace the grille, reposition it

carefully and press gently at the comers.

Do not push on the center area ofthe

grille.

The Ioudspeaker enclosure may be

cleaned with a slightly damp cloth.

The grille may be gently vacuumed,

and stains can be removed with an

aerosol cleaner following the manufac-

turer's instructions. Never use any

solvents to clean any part of the system.

Seruice

Should your loudspeaker ever need

service, retum it to the JBL dealer from

whom it was purchased. If for some

reason this is impractical, write directly to

the JBL Customer Service DeparÍnent,

describing the problem as fully as

possible. Do not retum products to the

JBL factory without prior authorization.

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T echnical Specifications

JBL2SOO JBL26OO JBL2SOO JBL3SOO JBL4SOO

High Frequency

Transducel 12 mm

titanium dome 12 mm

titanium dome

Low Frcquency

Transducer 5.25" high polymer 6.5" high polymer

laminate laminate 8" high polymer

laminate 8/ high polymer 10" high polymer

laminate laminate

Midranqe-

Tmnsducer 5' high polymer 5" high polymer

laminate la¡ninate

Crossover

Frequency 3 Wlz 3 kllz 2.5 kJIz 800 Hz

4.5 Wlz 800 Hz

4.5 kJIz

Frequency Ræponse

(-6 dB) 7O Hz to 23 kllz 45 Hz to 23 k}lz 4O Hz to 23 kllz 35 Hz to 23 kJIz 35 llz to 23 Wlz

Sensitivity

(1 WatUl metefl 88 dB 89 dB 89 dB 89 dB 9l dB

Nominal

lmpedance 8 Ohms 8 Ohms 8 Ohms 8 Ohms 8 Ohms

Recommended

AmPlifiel Power' lo to 80 watts l0 to 100 Watts t0 to 125 watts 10 to 150 watts 10 to 150 wâtts

Ertemal DimenSiOnS 12" x7.25" x 6.375"

(HxwxD) Itirffi; rer mm 17"x 9"x 8.3'15" 22.5"x llt'x l0t'

432mmx229 nm 572nmx279 mm

x 213 mm x 259 mm

32"x ll"x 10" 34httx13"xll/¿"

813 mm x279 mn 876.3mmx330.2mm

x 259 rnm x 298 mm

lVeight (each) 8 lbs. (3.6 kgs.) 12 lbs. (5.4 kgs.) 20 lbs. (9.0 kgs.) 29 lbs. (13.2 kgs.) 36 lbs. (16.3 kgs.)

+Undistorted continuous power per channel.

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JBL Consurner Products lnc.

JBL ín the USA

240 Crossways Park West

Woodbury, N.Y. 11797

Printed in USA

All contents

1988 JBL Consumer Products Inc.

Part JBL Series #70737

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