no
clanger
of
damaging
a
JBL
loudspeaker
if it is
operated
within
the
following
guidelines:
1)
the
signal
from
the
amplifier, regardless
of
its
rated
power,
is
not
distorted;
2)
the
amplifier
is
not
driven
into
clipping (another
form
of
distortion which
occurs
when
the
power output limitations
of
the
amplifier
circuitry
are
exceeded);
and
3)
the
power
cord
or
audio connectors
are not
inserted
or
unplugged
while
the
amplifier
is
operating.
However,
a
powerful
wide range amplifier
can
accidently damage
any
loudspeaker under certain
conditions.
For
example, rewinding
a
tape recorder
with
the
playback volume turned
up
can
generate "squeals"
powerful
enough
to
burn
out the
high frequency
unit.
Similarly,
powerful
low
frequency pulses extending
down
into
the
subsonic range
can
eventually damage
the
low
frequency loudspeaker.
If
the
phonograph
pickup
is
accidentally dropped
with
the
volume control
full
up,
or if
the
system
is
played very
loudly
with
excessive
bass
boost, nearly
the
full
rated power
of
the
amplifier
can
be
channeled
into
dangerous subsonic
energy.
The
components used
in
every
JBL
product
are
designed
and
produced
by
JBL
personnel
to
exacting
standards.
JBL
loudspeaker frames
are
massive
rigid
structures.
Magnetic
assemblies
are
precisely
manufactured
of
low-reluctance
iron,
energized
by
large,
high
grade magnets. Voice coils
are
held
to
within
one
turn
of
design specifications. Stamped frames,
punched magnetic structures
and
mass-produced voice
coils
would
be
less
expensive; however,
the
resultant
loss
of
structural integrity, magnetic force
and
acoustic
efficiency
would
tend
to
degrade
low-distortion
performance
and
transient response —qualities that have
become
JBL
hallmarks.
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b\ h<iur\
Thr-
detiivirirr
h^ivrp^n
"che ^VK°
> nil
aii*.
liiugn*^
^ca^Ttihjy
li
:>n>
linai!
thai
rti.y
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In
mr>\'^
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ini*j:ui!dliv'
'J <n{
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LOW
FREQUENCY-Solid,
well-defined
bass
reproduction
is
provided
by a
10-inch long-throw
loudspeaker.
Its
2%-pound low-loss magnetic assembly
concentrates
all the
energy
of an
Alnico
V
magnet
in the
one
place
where
it
contributes
to
performance
— the
voice
coil
gap. The
copper
voice coil,
two
inches
in
diameter,
drives
an
integrally stiffened
cone.
This large coil,
interacting
with
the
magnetic
field,
provides
the
mechanical drive
necessary
for
instantaneous transient
reproduction.
Mass
and
stiffness
of
the
cone
have been
carefully
selected
to
provide
optimum
low
frequency
bandwidth
and
definition.
The
cone
is
contained
within
9
SYSTEM
COMPONENTS
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