JBL CENTURY GOLD Manuel utilisateur

LIMITED EDITION

LOUDSPEAKER SYSTEM

Century Gold

A NEW STANDARD FOR A NEW CENTURY

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This certiﬁes that this

Century Gold is a Limited Edition

Reference Bookshelf Loudspeaker System,

in celebration of

JBL’s 50th Anniversary.

Genuine JBL

Greg Timbers

Senior Acoustic Engineer

Century Gold Loudspeaker System

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JBL is part of the Harman International family of audio companies, a group

with a common purpose: combining technology with a love of music to

manufacture audio products that provide new levels of satisfaction, perfor-

mance and value.

To promote diversity and creativity, JBL operates independently in research

and development. When it comes to translating the results of these efforts

into actual consumer and professional products, JBL draws on the full

combined strength of the Harman companies, including one of the world’s

most advanced manufacturing facilities. The result of this teamwork is that

JBL’s renowned excellence in engineering is successfully carried through to

each individual product, regardless of its application or price range.

As new audio concepts and technologies are pioneered, the partnership of

JBL and Harman International guarantees that consumer and professional

audio users everywhere will be able to enjoy their full beneﬁts.

JBL continually engages in research related to product development and

improvement. Because of this, new materials, production methods and

design reﬁnements may be introduced into existing products without notice.

For this reason, any current JBL product may differ in some respect from

its published description, but will always equal or exceed the original

design speciﬁcations unless otherwise stated.

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JBL wishes to thank you for selecting the Century Gold loudspeaker

system. While the Century Gold loudspeakers are a new development,

the ideas behind them go back to the earliest days of JBL. This system is a

deﬁnitive expression of JBL’s quality and craftsmanship. We have spared no

effort, overlooked no performance factor necessary to produce the most

accurate loudspeaker possible.

The attention to detail extends to the enclosure. The woodworking com-

plements the engineering. Carefully crafted in hardwood veneers, each

enclosure is ﬁnished by hand.

The Limited Edition Century Gold loudspeaker system will provide

many years of superb listening pleasure. Please take a moment to read this

owner’s manual completely before you begin. It is solely in the interest of

ensuring a perfect listening experience that we ask you to follow the setup

and hookup procedures outlined in this manual. No.

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No.

The Limited Edition Century Gold Bookshelf Loudspeakers set a new

standard for a new century. JBL combines the most advanced technology

with a classic JBL design. These speakers continue the longstanding

tradition of precise studio monitor sound for which JBL is famous. You

will enjoy the beneﬁts of pure titanium dome high-frequency transducers,

cast-frame low-frequency transducers with vented pole pieces, and JBL’s

proprietary Symmetrical Field Geometry (SFG™) magnet design, as well as

high-deﬁnition dividing networks incorporating the highest quality

electronic components available.

The Century Gold features an all-new 12" (300mm) low-frequency

transducer developed speciﬁcally for the Century Gold (Figure 1).

Derived from JBL’s legacy of highly powerful yet efﬁcient bass drivers, this

woofer delivers full low-frequency performance with clarity and speed

unprecedented among 12" drivers. The voice coil is 3" (76mm) in diameter

and wound on edge from ﬂat copper ribbon wire to a depth of 0.8" (20mm)

on a thermoset composite™form.

The cone is a rigid paper/ﬁberglass composite, treated with Aquaplas™for

strength, speed, and damping. JBL’s Symmetrical Field Geometry is

employed in the form of an aluminum sleeve around the pole piece. This

sleeve reduces second-order distortion through induced ﬂux control. Its

aluminum composition is also a more efﬁcient conductor of heat, so it

assists in dissipating heat away from the voice coil to extend the power

capacity. Cooling of the voice coil is further enhanced by the use of a vented

pole piece. The rigid frame is cast from aluminum alloy, an excellent

thermal conductor, which further acts to efﬁciently draw heat away from

the voice coil and magnet assembly. This combination of advanced design

technology results in a bass driver that is remarkably free from dynamic

restriction due to heat buildup.

Low-Frequency Transducer

Figure 1 Century 1200

Diecast aluminum

frame for high strength

Matched spider

(to motor for high linearity)

Extended pole

for symmetrical

flux field

0.8" (20mm)

long, 3" (76mm)

diameter edgewound

copper voice coil

for high linearity and

power handling

Thick magnet for high excursion

capability and high flux density

Thick .28" (7mm)

top plate for good

heat sinking,

low magnetic leakage

Aquaplas-

treated

composite cone

Foam

air filter

Heavy aluminum sleeve for

reducing second-order

harmonic distortion due to

flux modulation distortion

Low-Frequency Transducer

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The Century Gold also features an all-new 5" (127mm) mid-frequency

transducer developed speciﬁcally for the Century Gold (Figure 2). The

voice coil is 2" (50mm) in diameter and wound on edge from ﬂat aluminum

ribbon wire to a depth of precisely .4" (11mm) on a thermoset composite™

form. The cone is made of Kevlar®with a composite rubber/vinyl surround.

Kevlar was chosen for the cone material because it is extremely strong and

rigid while relatively low in mass. This allows the driver to move fast

enough to reproduce the dynamics of the critical midrange frequencies while

retaining the low distortion characteristics necessary for accurate musical

reproduction. Its very high power capability and freedom from breakup

make it an ideal midrange in a system that is designed to play at high levels

with absolutely no signs of distress. It makes the transition from the woofer

at 600Hz, providing good dispersion throughout the important vocal range.

Throughout the history of high-frequency transducer design, the goal of

extended frequency response has been at odds with the need for high

power handling. JBL has long chosen titanium as the material for its

highest quality high-frequency transducers and the Century Gold is

no exception (Figure 3). Titanium possesses the essential requirements for

a high-frequency transducer. First, titanium is extremely light yet rigid.

The goal is to maintain a piston-like action as high in frequency as possible.

If the material ﬂexes easily, the diaphragm will break up into random

vibrations. Second, titanium is virtually free from fatigue. The material

is virtually immune from the cumulative effects of millions of ﬂexures

over long operating periods. These factors, coupled with the higher power

handling that titanium affords, allow us to produce an extremely smooth

high-frequency transducer with extended frequency response that can handle

all the demands of today’s digital programs.

High-Frequency Transducer No.

1"copper

voice coil

provides

smooth

performance

and high

power

handling

Cast zinc faceplate

for less resonance

Titanium dome

Figure 3 050 Gold

High-Frequency Transducer

Mid-Frequency Transducer

Diecast aluminum frame

for high strength

Rubber/vinyl

surround

Vented pole piece allows

driver to run cooler

Neodymium magnet provides

high flux density with low mass

0.4" (11mm) long,

2" (50mm)

diameter edgewound

aluminum voice coil for

high linearity and

power handling

Kevlar

cone

Figure 2 Century 500

Mid-Frequency Transducer

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The job of the dividing network is to distribute the various frequencies to

their respective transducers. The network is also designed to complement

component location on the bafﬂe. Slopes are chosen to match the exact

response of each driver in its respective frequency range, as well as to

ensure that the high-frequency transducers are adequately protected from

dangerous low-frequency components.

For the Century Gold system, we chose our Charge-Coupled Linear

Deﬁnition™Dividing Network. The inductors are all designed for high-

current, low-distortion operation. All capacitors in the network are

series/parallel connected and operated with D.C. bias. This effectively

enables the capacitors to operate in “Class A” mode, which substantially

increases sonic detail, resolution, and dynamics. The low-frequency section

of the dividing network is mounted on a dedicated circuit board that

separates both electrical and magnetic properties from that of the

midrange and tweeter sections.

Additionally, the Century Gold’s dividing network allows for passive,

bi-wire, passive bi-amp, and full active bi-amp operation. For the full active

bi-amp mode we recommend the use of a high-quality electronic crossover.

Dividing Networks

No.

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The battery should be replaced approximately every 2 years. This is

accomplished as follows:

• Unscrew the two screws that hold the battery access cover in place. It

is located on the upper portion of the dividing network, on the rear of

the speaker enclosure (Figure 4).

• Write today’s date, including the year, in this manual.

• Install the battery by aligning the battery terminals with the mating

terminals in the network housing. Align male to female, female to

male terminals, then snap the connectors together, assuring a tight

connection.

• Replace the battery access cover and install screws.

Battery Replacement Record

Date Installed: No.

Battery Replacement

BATTERY

BI-AMP

High Frequency

Low Frequency

JBL INCORPORATED

8500 Balboa Blvd., Northridge, CA USA

NORMAL/

BI-WIRE

Figure 4 Battery Installation

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Ideally the systems should be placed at least three feet from any walls. The

height, at the top of the midrange, should be at ear level. The two speakers

should be equidistant from your primary listening position; the distance

should be determined by the distance between the speakers. We recommend

that the angle between the speakers, at the listening position, be between

45° to 60°. For example, if the speakers are 8' apart, your listening position

should be 8'–12' from each speaker. To widen the area in which the best

stereo image will be perceived, turn the speaker to face the primary

listening position (Figure 5).

It is normally recommended that the Century Gold loudspeakers be

positioned so that the high-frequency transducers are towards the inside.

In some listening environments, however, the imaging characteristics may

be improved by positioning the high-frequency transducers towards the

outside. We suggest you experiment with the positioning of your loud-

speakers to determine the ideal placement in your listening room.

Placement

No.

3'3' 3'

10 –15

3'3'

10 –15

3'3'3'3' Ear level when

seated in listening

position

Figure 5 Placement

Position Top View

Position Front View

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The Century Gold loudspeakers can be connected by one of several

methods. The binding posts on the rear panel of the Century Gold

will accept most types of audio cable and connectors, including banana

plugs and bare wire (Figure 6). Follow the hookup method that best

describes your system.

1. For each channel, connect the red (+) terminal on the

Century Gold to the red (+) terminal on your ampliﬁer.

2. For each channel, connect the black (-) terminal on the

Century Gold to the black (-) terminal on the ampliﬁer.

Connecting the systems in this manner ensures that they will operate in

phase; that is, they will work together rather than in opposition.

Connecting the speaker system out of phase will not cause damage but

will adversely affect the speaker’s sound.

No.

Speaker Connections

LOW FREQUENCY

HIGH FREQUENCY

LOW FREQUENCY

JBL INCORPORATED

8500 BALBOA BLVD. NORTHRIDGE, CA USA

HIGH FREQUENCY

JBL INCORPORATED

8500 BALBOA BLVD. NORTHRIDGE, CA USA

Figure 6 Connections

Banana/Spade

Connecting Method

Bare Wire

Connecting Method

LOW FREQUENCY

HIGH FREQUENCY

JBL INCORPORATED

8500 BALBOA BLVD. NORTHRIDGE, CA USA

Figure 7 Standard

Connecting Method

Standard Connections (Figure 7)

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