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Model
CENTURY GOLD
Pages
16
Size
380.92 KB
Type
PDF
Document
User Manual / Operation Manual
Brand
Device
Audio
File
century-gold.pdf
Date

JBL CENTURY GOLD User Manual / Operation Manual ▷ View online

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.
7
3'
3'
3'
10 – 15
3'3'
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.
8
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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The 
Century Gold’s
outer connection panel and internal dividing 
network are designed so that separate sets of speaker cable can be attached
to the low-frequency transducer and midrange/high-frequency transducer
portions of the dividing network. This is called bi-wiring. Bi-wiring can
provide several sonic advantages and considerably more flexibility in
power amplifier selection. The advantages of bi-wiring are as follows:
The majority of current flowing between an amplifier and speaker is devoted
to bass reproduction. In fact, 60% or more of an amplifier’s output is des-
tined for the woofers. When current flows through a wire, it produces an
electro-magnetic field (EMF) that expands and collapses at a rate equal to
that of the music’s complex frequency components. If a single speaker 
wire must conduct the full musical frequency, the preponderance of low-
frequency information can interact with or modulate high frequencies. 
The resulting intermodulation can create audible changes to the high 
frequencies even before they reach the loudspeakers.
By using separate cables for high and low frequencies, unwanted high- 
frequency modulation is avoided. Low-frequency information flows
through one cable while high frequencies flow through another.
Having the opportunity to use separate low- and high-frequency cables
allows you to use cables best suited to each frequency range. Optimally,
you should use high-quality, audiophile-grade speaker cables for both low-
and high-frequency conductors. However, let your ears guide you to the
cables that best match the
Century Gold
loudspeakers to your amplifier.
Bi-wiring also allows you the option of using separate stereo power 
amplifiers for left and right speakers, or even four mono amplifiers.
Whether you use two or four amplifiers, it is important to use the same
brand and model to power like connections on the
Century Gold.
Frequency-optimized Cables
No.
9
Reduction of Intermodulation 
Bi-Wiring
Amplifier Flexibility
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Figures 8 through 10 show two bi-wiring options, single stereo amplifier
and dual stereo amplifier modes. For passive and bi-wire connections, set
the switch to the Normal/Bi-Wire position (Figure 8a).
1. The external “strapping bars” that normally connect the 
Century
Gold’s
low-frequency and high-frequency terminals must be removed before
bi-wiring. To remove the shorting straps, simply loosen and slide the bars
off to the side (Figure 11).
2. Never connect two amplifiers to the same loudspeaker without first removing the
strapping bars. Operating two amplifier channels without removing the
strapping bars can seriously damage your amplifiers!
3. If you have hooked up your
Century Gold
loudspeakers in any of
the bi-wire configurations indicated, it is not advisable to use additional
speakers separately or simultaneously.
4. As with conventional one-amplifier connections, make sure that all
speaker cables are the same length.
No.
10
LOW FREQUENCY
JBL INCORPORATED
8500 BALBOA BLVD. NORTHRIDGE, CA USA
Figure 8  Bi-Wire Connecting Method
AMP
NORMAL/
BI-WIRE
Figure 8a  Normal/Bi-Wire Position
Bi-AMP
NORMAL/
BI-WIRE
HIGH FREQUENCY
LOW FREQUENCY
HIGH FREQUENCY
JBL INCORPORATED
8500 BALBOA BLVD. NORTHRIDGE, CA USA
Figure 11 Removal of Shorting Straps
AMP
NORMAL/
BI-WIRE
HF
LF
HF
Preamp
Stereo amp
LF
Figure 9  One-Amp Bi-Wire
HF
LF
HF
Preamp w/Y-corded output
Stereo amps
LF
Figure 10  Two-Amp Bi-Wire
Important
Bi-Wiring Connections
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