JBL K2S5800 (serv.man2) User Manual / Operation Manual ▷ View online
After Project Everest was intro-
duced, sound recording and play-
back technology underwent a
revolution of its own. With the
advent of CD, extremely demanding
recorded signals had become the
rule rather than the exception –
the average source material used
by the typical audio enthusiast
had become superior to the best
demonstration material of even just
a few years ago. In overall dynam-
ics and transient response, trans-
ducers were once again a potential
weak link in the high-end audio
reproduction chain.
duced, sound recording and play-
back technology underwent a
revolution of its own. With the
advent of CD, extremely demanding
recorded signals had become the
rule rather than the exception –
the average source material used
by the typical audio enthusiast
had become superior to the best
demonstration material of even just
a few years ago. In overall dynam-
ics and transient response, trans-
ducers were once again a potential
weak link in the high-end audio
reproduction chain.
It was in this environment that JBL
set out to create its fourth and fifth
Project loudspeakers, K2 S9500 and
K2 S5500. As with Hartsfield, the
simplicity of a two-way system was
considered the most promising
design track. Advances in trans-
ducer design and low-frequency
alignment would make the con-
struction of a two-way system
of unprecedented physical and
acoustical scale possible. Engineers
took the core components – the
low- and high-frequency drivers –
and optimized them by redesign-
ing their magnetic structures,
diaphragms and framework for
greater linearity, dynamic capability
and transient response.
set out to create its fourth and fifth
Project loudspeakers, K2 S9500 and
K2 S5500. As with Hartsfield, the
simplicity of a two-way system was
considered the most promising
design track. Advances in trans-
ducer design and low-frequency
alignment would make the con-
struction of a two-way system
of unprecedented physical and
acoustical scale possible. Engineers
took the core components – the
low- and high-frequency drivers –
and optimized them by redesign-
ing their magnetic structures,
diaphragms and framework for
greater linearity, dynamic capability
and transient response.
In the years following the introduc-
tion of the K2 S9500 and K2 S5500,
sound reproduction technology has
undergone another series of revolu-
tionary changes, with the introduc-
tion of DVD-Video, Dolby* Digital,
DTS,
tion of the K2 S9500 and K2 S5500,
sound reproduction technology has
undergone another series of revolu-
tionary changes, with the introduc-
tion of DVD-Video, Dolby* Digital,
DTS,
®
DVD-Audio, and Super Audio
CD (SACD). Frequency responses to
50kHz and 3-digit dynamic range
and signal-to-noise ratios have now
become commonplace. In order to
faithfully reproduce such robust
sonic properties, the loudspeaker
needed to undergo drastic improve-
ments to its transducer, network
and enclosure technologies.
50kHz and 3-digit dynamic range
and signal-to-noise ratios have now
become commonplace. In order to
faithfully reproduce such robust
sonic properties, the loudspeaker
needed to undergo drastic improve-
ments to its transducer, network
and enclosure technologies.
See Figure 1.
Unlike the earlier Projects K2 S9500
and K2 S5500, the new K2 S5800
employs a 3-way, four-driver
design, incorporating an ultrahigh-
frequency (UHF) compression driver
and horn to reproduce high fre-
quencies up to 50kHz. With the UHF
handling the high frequencies, the
high-frequency (HF) transducer
could then be upgraded to a new
design using a 3-inch diaphragm
for better reproduction of lower
frequencies and better blend with
and K2 S5500, the new K2 S5800
employs a 3-way, four-driver
design, incorporating an ultrahigh-
frequency (UHF) compression driver
and horn to reproduce high fre-
quencies up to 50kHz. With the UHF
handling the high frequencies, the
high-frequency (HF) transducer
could then be upgraded to a new
design using a 3-inch diaphragm
for better reproduction of lower
frequencies and better blend with
the dual woofers than the older
generations’ 2-inch diaphragm.
Both compression drivers are
mounted in a unique combination
Bi-Radial
generations’ 2-inch diaphragm.
Both compression drivers are
mounted in a unique combination
Bi-Radial
®
horn structure,
precision-molded from JBL’s
proprietary SonoGlass
proprietary SonoGlass
™
material, an
extremely dense and mechanically
inert substance that is easily
molded into the unusual shapes
required for superior acoustic
performance.
inert substance that is easily
molded into the unusual shapes
required for superior acoustic
performance.
5
SonoGlass
Bi-Radial Horn
90
°
Horizontal
50
°
Vertical
Curved
Dress
Panel
Spiked Feet
Foot Base
1" MDF
Construction
Construction
1200FE
12" LF
Driver
12" LF
Driver
1200FE
12" LF
Driver
12" LF
Driver
Port
Tube
Tube
435AL
3" HF
Compression
Driver
3" HF
Compression
Driver
045Ti
1" UHF
Compression
Driver
Figure 1. Cutaway view of Project K2 S5800 speaker system.
In order to re-create the extremely
high dynamic range provided by
today’s audio sources, a new low-
frequency transducer was used,
incorporating a ferrite magnet, 3-
inch edge-wound voice coil, and
an Aquaplas
high dynamic range provided by
today’s audio sources, a new low-
frequency transducer was used,
incorporating a ferrite magnet, 3-
inch edge-wound voice coil, and
an Aquaplas
™
-coated 12-inch cone
made of Kevlar
®
composite, a
mixture of Kevlar fiber and pulp
material that provides increased
rigidity. An EPDM rubber sur-
round was chosen for both its
flexibility and long life. The
Symmetrical Field Geometry
material that provides increased
rigidity. An EPDM rubber sur-
round was chosen for both its
flexibility and long life. The
Symmetrical Field Geometry
™
(SFG) magnetic structure mini-
mizes second harmonic distortion
by providing a uniform flux field
that avoids uneven cone move-
ment. The rigid cast-aluminum
frame is also designed to mini-
mize distortion, as aluminum has
no effect on the magnetic field.
Extensive computer-aided engi-
neering and design effort made to
develop the optimized port tuning
employed in Project K2 S5800 has
resulted in a significant advance in
the concept of state-of-the-art bass
reproduction. This proprietary align-
ment method offers the best damp-
ing characteristics and provides
extremely fast alignment, eliminat-
ing the typical “bass-reflex” sound
of a ported system.
mizes second harmonic distortion
by providing a uniform flux field
that avoids uneven cone move-
ment. The rigid cast-aluminum
frame is also designed to mini-
mize distortion, as aluminum has
no effect on the magnetic field.
Extensive computer-aided engi-
neering and design effort made to
develop the optimized port tuning
employed in Project K2 S5800 has
resulted in a significant advance in
the concept of state-of-the-art bass
reproduction. This proprietary align-
ment method offers the best damp-
ing characteristics and provides
extremely fast alignment, eliminat-
ing the typical “bass-reflex” sound
of a ported system.
All three transducers are built using
the most advanced materials and
precision manufacturing tech-
niques refined from renowned JBL
professional sound systems.
the most advanced materials and
precision manufacturing tech-
niques refined from renowned JBL
professional sound systems.
High power-handling capability
results in no limitations on the types
of source material. Project K2 S5800
has very high input sensitivity; even
a relatively small high-end amplifier
can provide full dynamic range
without compression.
results in no limitations on the types
of source material. Project K2 S5800
has very high input sensitivity; even
a relatively small high-end amplifier
can provide full dynamic range
without compression.
Despite its power and sophistica-
tion, Project K2 S5800 is a marriage
of tradition and technology. It
reflects the design, engineering and
manufacturing expertise derived
and refined through nearly six
decades of experience that are
the exclusive province of one
loudspeaker builder: JBL.
tion, Project K2 S5800 is a marriage
of tradition and technology. It
reflects the design, engineering and
manufacturing expertise derived
and refined through nearly six
decades of experience that are
the exclusive province of one
loudspeaker builder: JBL.
6
CHAPTER 2 – THE PROJECT K2 S5800 LOUDSPEAKER:
A TRIUMPH IN ACOUSTICS AND TECHNOLOGY
A TRIUMPH IN ACOUSTICS AND TECHNOLOGY
The following sections describe
the primary features and compo-
nents of the Project K2 S5800
loudspeaker system.
the primary features and compo-
nents of the Project K2 S5800
loudspeaker system.
The enclosure of the K2 S5800
is specially designed to transfer
unwanted mechanical energy
away from any acoustically active
surfaces, virtually eliminating
coloration.
is specially designed to transfer
unwanted mechanical energy
away from any acoustically active
surfaces, virtually eliminating
coloration.
The massive enclosure, along
with its specially designed brass
modular feet, couples directly to
the floor, and the system literally
becomes a structural part of its
environment. Any vibration is
transmitted harmlessly down the
channel provided by the ring/
disc axes and into the floor. The
SonoGlass combination horn
maintains a smooth energy
transmission path.
with its specially designed brass
modular feet, couples directly to
the floor, and the system literally
becomes a structural part of its
environment. Any vibration is
transmitted harmlessly down the
channel provided by the ring/
disc axes and into the floor. The
SonoGlass combination horn
maintains a smooth energy
transmission path.
The Project K2 S5800 transducer/
enclosure arrangement represents
the best possible balance of the
various tuning options and avoids
the mid-bass response buildup
found in other vented systems.
Response works with, rather
than against, the effects of
“room loading.”
enclosure arrangement represents
the best possible balance of the
various tuning options and avoids
the mid-bass response buildup
found in other vented systems.
Response works with, rather
than against, the effects of
“room loading.”
The unique design of the Project K2
system is the platform for its equally
unique acoustical attributes.
system is the platform for its equally
unique acoustical attributes.
Thanks to the centrally mounted
combination horn, both the UHF
(ultrahigh-frequency) and HF (high-
frequency) drivers are located at
the ear level of the listener.
combination horn, both the UHF
(ultrahigh-frequency) and HF (high-
frequency) drivers are located at
the ear level of the listener.
See Figure 2.
The large 3-inch HF transducer
allows the two 12-inch woofers to
be crossed over at a frequency low
enough to eliminate any audible
effects of their exact location and
proximity.
allows the two 12-inch woofers to
be crossed over at a frequency low
enough to eliminate any audible
effects of their exact location and
proximity.
Full image coherency is main-
tained, resulting in an acoustically
tained, resulting in an acoustically
stable pinpointed stereo image. All
the sound seems to come from the
combination horn in the center.
Music imaging is more realistic
since the sound appears to emanate
from one point and not from multiple
points at different times.
the sound seems to come from the
combination horn in the center.
Music imaging is more realistic
since the sound appears to emanate
from one point and not from multiple
points at different times.
Project K2 is a constant-angle sys-
tem without regard to frequency.
Careful horn design enables the
loudspeaker to strictly adhere to a
60° horizontal/30° vertical coverage
pattern. This Controlled Coverage
arrangement precisely defines the
optimum listening area and mini-
mizes room effects. At the same
time, it provides a generous “sweet
spot” for more comfortable critical
listening sessions.
tem without regard to frequency.
Careful horn design enables the
loudspeaker to strictly adhere to a
60° horizontal/30° vertical coverage
pattern. This Controlled Coverage
arrangement precisely defines the
optimum listening area and mini-
mizes room effects. At the same
time, it provides a generous “sweet
spot” for more comfortable critical
listening sessions.
THE DUAL 1200FE LOW-
FREQUENCY DRIVERS
FREQUENCY DRIVERS
See Figure 3.
In order to achieve the lowest pos-
sible distortion and compression
along with the high linear excur-
sion necessary, the 1200FE is
equipped with a ferrite magnet.
As with earlier Project K2 low-
sible distortion and compression
along with the high linear excur-
sion necessary, the 1200FE is
equipped with a ferrite magnet.
As with earlier Project K2 low-
Figure 2. Height of K2 S5800 speaker system in relation to listener.
Terminal Base
Glass-Filled ABS
Glass-Filled ABS
Terminals
Gold-Plated 5-Way
Binding Posts
Gold-Plated 5-Way
Binding Posts
Magnet
Ceramic
Ceramic
Back Plate
Steel SAE-1008
Steel SAE-1008
Pole Sleeve
Hi-Purity Copper
Hi-Purity Copper
Voice Coil
Aluminum Ribbon Wire
ES-1350 on High Temp
Fiberglass Former
Aluminum Ribbon Wire
ES-1350 on High Temp
Fiberglass Former
Cone Body
Special Paper
Pulp Composite
Special Paper
Pulp Composite
Frame
Cast 380
Aluminum
Trim Ring
NBR Rubber
Spider Spacer
Extruded Aluminum
6063
Dust Dome
Paper Pulp
Paper Pulp
Composite
Spiders
Nomex
®
Pigtail Leads
Silver-Plated
Silver-Plated
Cadmium Copper
w/Conex Core
Polepiece
Steel SAE-1008
Steel SAE-1008
Surround
EPDM Foam Rubber
Figure 3. Cutaway view of 1200FE low-frequency transducer.
7
frequency drivers, it utilizes
forced-air cooling. The entire
magnetic structure is attached to
a die-cast aluminum-alloy frame.
This provides accurate, rigid
support for the motor and cone
mounting points, as well as
doubling as a massive heatsink
by providing a huge surface area
for heat dissipation.
forced-air cooling. The entire
magnetic structure is attached to
a die-cast aluminum-alloy frame.
This provides accurate, rigid
support for the motor and cone
mounting points, as well as
doubling as a massive heatsink
by providing a huge surface area
for heat dissipation.
The 1200FE has a central cooling
duct which effectively cools the
voice coil and reduces the likeli-
hood of hot spots. By reducing the
operating temperature of the voice
coil, power compression is signifi-
cantly reduced, which enables the
low-frequency driver to operate in
a more linear fashion over a wider
sound pressure level (SPL) range.
duct which effectively cools the
voice coil and reduces the likeli-
hood of hot spots. By reducing the
operating temperature of the voice
coil, power compression is signifi-
cantly reduced, which enables the
low-frequency driver to operate in
a more linear fashion over a wider
sound pressure level (SPL) range.
The voice coil itself is constructed
from edge-wound aluminum wire
on a massive 3-inch-diameter
fiberglass former. This configura-
tion provides for further cooling
ability in conjunction with the
motor design.
from edge-wound aluminum wire
on a massive 3-inch-diameter
fiberglass former. This configura-
tion provides for further cooling
ability in conjunction with the
motor design.
The Aquaplas-coated, Kevlar-
composite cone, along with the
EPDM rubber surround, provides
excellent damping and transient
response characteristics.
composite cone, along with the
EPDM rubber surround, provides
excellent damping and transient
response characteristics.
435AL ALUMINUM
DIAPHRAGM/
NEODYMIUM MAGNET
HIGH-FREQUENCY
COMPRESSION DRIVER
DIAPHRAGM/
NEODYMIUM MAGNET
HIGH-FREQUENCY
COMPRESSION DRIVER
See Figure 4.
The 435Al neodymium high-
frequency compression driver is
based on the professional JBL 2430
device. It incorporates a rare-earth
neodymium magnet structure,
designed by extensive computer
modeling, including finite element
analysis, which combines the
attributes of efficiency, strength,
low mass and compact size. This
motor structure is coupled with
a 3-inch aluminum diaphragm.
Aluminum provides improved low-
distortion characteristics and flat
frequency response.
frequency compression driver is
based on the professional JBL 2430
device. It incorporates a rare-earth
neodymium magnet structure,
designed by extensive computer
modeling, including finite element
analysis, which combines the
attributes of efficiency, strength,
low mass and compact size. This
motor structure is coupled with
a 3-inch aluminum diaphragm.
Aluminum provides improved low-
distortion characteristics and flat
frequency response.
High-temperature materials and
adhesives allow the driver to han-
dle extremely high power levels
over extended periods of time. The
SonoGlass horn is acoustically
inert and precision-molded to
exacting tolerances.
adhesives allow the driver to han-
dle extremely high power levels
over extended periods of time. The
SonoGlass horn is acoustically
inert and precision-molded to
exacting tolerances.
Phase Plug
Aluminum
Edge-Wound
Voice Coil
Neodymium
Magnet
Aluminum-
Alloy Cover
Alloy Cover
75mm
Pure-
Aluminum
Diaphragm
Pure-
Aluminum
Diaphragm
Binding-
Post Input
Terminal
Post Input
Terminal
Figure 4. Cutaway view of 435Al high-frequency transducer.
8
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