JBL Century Gold User Manual
LIMITED EDITION
LOUDSPEAKER SYSTEM
Century Gold
A NEW STANDARD FOR A NEW CENTURY
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Century Gold Loudspeaker System
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
JBL is part of the Harman International family of audio companies, a group
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with a common purpose: combining technology with a love of music to
manufacture audio products that provide new levels of satisfaction, performance 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.
JBL wishes to thank you for selecting the Century Gold loudspeaker
system. While the
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 complements the engineering. Carefully crafted in hardwood veneers, each
enclosure is finished by hand.
Century Gold loudspeakers are a new development,
The Limited Edition
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.
Century Gold loudspeaker system will provide
No.
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No.
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
Aquaplastreated
composite cone
Foam
air filter
Heavy aluminum sleeve for
reducing second-order
harmonic distortion due to
flux modulation distortion
Low-Frequency Transducer
3
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.
Low-Frequency Transducer
The
Century Gold features an all-new 12" (300mm) low-frequency
transducer developed specifically for the
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.
Century Gold (Figure 1).
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.
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