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JBL K Series: A new generation of powerful musical instrument loudspeakers with
the unmistakable sound quality and high
efficiency that have become a virtual J~L
trademark since the famous F Series was
introduced a decade ago.
In the early sixties, performers using
amplified musical instruments had very
special ideas about the kind of sound they
wanted - sound they couldn’t get from
standard loudspeakers. To satisfy rheir
unique requirements, major guitar man”.
facturers and musicians - from profes.
sional to beginner - turned to JBI.. The
F Series provided the answer -with sound
quality, efficiency and reliability only JBL
could offer.
That was the sixties. Today, amplifier
power is much greater, listening castes have
grown increasingly sophisticated and the
demands placed on musical insrrument
loudspeakers are more critical than ever
before - precisely the reasons why ~sr
developed the K Series.
New materials have been formulated for
high stress areas of the cone and voice coil
which give K Series loudspeakers double
the power handling capability of the previous F Series. For example, a K140 will
cake the full output of a 150.wacr continuous sine wave amp and still sound
clean ac any volume level-from a whisper
fo an explosion.
The K Series delivers more sound per
waft than other musical instrument loudspeakers. The punch in bass notes is deep
and solid; midrange bite is crisp and clear;
with brilliance in the highs for distinctive
cone character. JBI. sound at its best, with
efficiency co match.
The K Series technology
Each loudspeaker in the K Series is designed co traditional JBL quality standards.
High strength Alnico V magnets in massive cast iron magnetic structures conduct
energy directly to large, handwound voice
coils made of ribbon wire. These precisely
machined components yield maximum
loudspeaker efficiency and power handling
capacity. Cone surround fatigue has been
virtually eliminated by the use of new
compounds and materials developed by
.JBL. Such improvements meet the stringent
demands of amplified musical instruments
and provide unsurpassed durability.
c
e
KllO lo-inch
Here is a loudspeaker that can take 75
watts continuous sine wave and deliver
c
mote sound output per amplifier watt than
any other loudspeaker its site.
Sustain is highly ptcdictable and overtone characteristics ate brilliant, making
the KI 10 an obvious choice where small
size and big system prtfotmancc arc tequired Considered to be Jw’s crispest
sounding musical instrument loudspeaker,
it’s tight at home with lead and rhythm
guitar, organ, ot when stacked in a column
for PA use.
The KI 10 may bt small, but its large
3-inch diameter voice coil speaks with real
musical authority.
K120 12.inch
This remarkable loudspeaker is more ctlcient and can handle greater power than
most 15.inch models. Its full-range teptoduction and 100.watt continuous sine wave
rating offer performance that will satisfy
the most critical musician. The K120
directly replaces conventional 12.inch
musical instrument loudspeakers used in
guitar amps, organs, electric pianos and
c
similar applications.
The K120 has the same huge magnet
sttnctute and 4.inch voice coil as the 15.
inch K130. That’s why midrange and highs
are bright, bass is smooth, and the efi-
ciency’s so outstanding in this 12-&h
music maker by JBL.
K130 15.inch
The K130 is J&s most rugged and efficient extended range musical instrument
loudspeaker. Its 125.watt continuous sine
wave power handling capability qualifies
it as the ideal reproducer for lead and
rhythm insttumcnts. The 15.inch cone area
provides considerably more output than
smaller cones without the slightest sacrifice
in midrange and high frequency reptoduction.
K130 - the only choice when loudspeaker size is not testticted and ttemendous musical sound levels are required.
K140 15.inch
This superb low frequency transducer is
(;
spectally designed for bass guitarists and
organists to reproduce the rich fundamcntal tone character of their instruments.
Conservatively rated at 150 watts continous sine wave, the K140 delivers pure
bass nofes even at thunderous levels with
efficiency that’s unmatched by any other
15.inch bass loudspeaker. The K140 is
15-112 pounds of low frequency dynamite.
K145 Bass Instrument Loudspeaker
A Success Story. The objective: To cteatr
brand new sound in a 15.inch bass instrument loudspeaker - sharply defined, crisp
sound that projects a bigger bass punch
than ever heard before from other loudspeakers its size. Plus the same high efi-
ciency and power handling that have made
JBL the overwhelming choice of ptofessionals for 0x1 30 years.
The K145’s special cone is powered by
the most massive magnetic strnctute JBL
has every built. 20 pounds worth, and in
the JBL tradition, all critical areas arc precisely machined far optimum performance.
It contains a large, costly Alnico V magnet
(250% sttonger per pound than convcntionally used ceramic types) that directs
tremendous energy fo the magnetic gap
through a huge cast iron pot ~ttucturc.
Within the magnetic gap lies a 4.inch
diameter voice coil of copper wire, milled
to a fine ribbon then tightly wound by
hand on its narrow edge. Compared to
small, machine made coils of round witc
which ate tgpically used in other speakers,
this process increases efficiency, expands
dynamic range and provides outstanding
definition ~ the kind of cxtta performance
a musician expects from JBL.
K151 Bass Instrument Loudspeaker
JBL’s new K151 is a powethousc lx-inch
loudspeaker made especially for electric
bass, and designed for unsurpassed petformance in horn-loaded ot reflex en-
closures.
Kl5l has it all. 20 pounds of precision
machined Alnico V with high grade iron
and steel for a super strong magnetic sttucture. A big 4~inch voice roil of special ribbon wire which places 2470 mote wire in
the magnetic gap than standard coils of
round wire. Finally, a cone that’s an optimum combination of stiffness, density and
mass
the result is massive amounts of force
that give K151 outstanding efficiency, unmatched power handling capacity and
sound - from C sharp clear down to low
E. Perfectly, Powctfullg.
Power Handling Capaciq
Since a number of manufacturcts continue
to USC the less srringent “continuous program power” rating. we have included
these figures for you refctcnce.
The continuous program power method
of rating is acceptable for loudspeakers
used at home, because the dynamic range
of music they reproduce has been greatly
compressed in the recording process and
playback levels arc tclatively modetatc. As
a result, demands placed on home enteitainment loudspeakers are far less critical
than those used with amplified musical insttulnents.
In contrast, musical instrument loudspeakers rcccivr their signal directly ftom
a performer’s insttument - with all of its
wide dynamic range and eaplosivc ttansicnts. Amplifier power and volume level
ate often very high - especially during live
performances.
Because these conditions arc so sevete,
we prefer the continuous sine wave method
for rating power handling capacity. This
laboratory standard test is far more dcmanding than actual performance situations, and provides a truly ctediblc measure of a loudspeaker’s capability.
Loudspeakers can be most easily ovctdriven where their measured impedancr
is at its minimum point (impedance actu-
ally varies from low to high frequencies
in all loudspeakers j, For this reason, we
require the K Series loudspeakers to withstand its full rated power input at all frequencies within one-half an octave on each
side of the minimum impedance region and to sustain this performance continuously fot one hour without damage.
While other methods can be used to
achieve even greater power rating figures,
such as instantaneous ot peak, JBL’S tests
and power ratings provide a musician with
specifications that ate realistic in relation
to his performance requitcments.
ill
mm
4-3/R in 4.314 in I-518 in T-518 in
1.7
kg 6.4 kg
n-114 lb 14 lb
121
mm
143 mm 143 nlm 168 mm
7.0
kg
IT-I/~ lb
7.0
kg
15-112 Ih 25.314 lb
6.518 in
1 L., kg
194 mm
7-1/x in
11.9 kg
X-1,4 Ib
Series
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