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The following sections describe
the primary features and compo-
nents of the S4800 loudspeaker
system.
The enclosure of the
S4800
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.
The
S4800
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.”
The unique design of the system
is the platform for its equally
unique acoustical attributes.
Thanks to the 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 15-inch woofer to be
crossed over at a frequency low
enough to eliminate any audible
effects of its exact location and
proximity.
Full image coherency is main-
tained, resulting in an acoustically
stable pinpointed stereo image. All
the sound seems to come from the
combination horn. Music imaging
i
s more realistic
s
ince the sound
appears to emanate from one point
and not from multiple
points at dif-
ferent times.
The S4800
is a constant-angle sys-
t
em without regard to frequency.
Careful horn design enables the
loudspeaker to strictly adhere to a
100° horizontal/60° vertical cover-
age pattern. This controlled cover-
age arrangement precisely defines
the optimum listening area and
minimizes room effects. At the
same time, it provides a generous
“sweet spot” for more comfortable
critical listening sessions.
THE 1500FE LOW-
FREQUENCY DRIVER
See Figure 3.
In order to achieve the lowest pos-
sible distortion and compression
along with the high linear excur-
sion necessary, the 1500FE is
equipped with a ferrite magnet.
As with earlier JBL low-frequency
drivers, it utilizes forced-air cool-
ing. The entire magnetic structure
Figure 2. Height of S4800 speaker system in relation to listener
.
Terminal Base:
Glass-Filled ABS
Terminals:
Gold-Plated 5-Way
Binding Posts
Magnet:
Ceramic
Back Plate:
Steel SAE-1008
Pole Sleeve:
High-Purity Copper
Voice Coil:
Aluminum Ribbon Wire
ES-1350 on High-Temp
Fiberglass Former
Cone Body:
Special Paper-
Pulp Composite
Frame:
Cast 380
Aluminum
Trim Ring:
NBR Rubber
Spider Spacer:
Extruded Aluminum
6063
Dust Dome:
Paper-Pulp
Composite
Spiders:
Nomex
®
Pigtail Leads:
Silver-Plated
Cadmium Copper
w/Conex Core
Polepiece:
Steel SAE-1008
Surround:
EPDM Foam Rubber
Figure 3. Cutaway view of 1500FE low-frequency transducer.
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S4800 OM 10/11/05 1:51 PM Page 5