The L100
Century is the most successful bookshelf loudspeaker ever produced by JBL. It
may be the most successful loudspeaker in its class ever produced by anyone.
But we don't
expect you to take our word alone. The plain fact is that the L100 was offered
for home use only after it proved to be a runaway bestseller with studio
recording engineers - the most demanding listeners you'll ever find.
This
professional acceptance was no accident. The speaker was originally developed
and offered for sale as a control monitor for recording studios.
Technical
Information
Low
Frequency
Music below
1500 Hz is reproduced by a powerful 12 inch, long excursion loudspeaker with
3-inch edgewound copper ribbon voice coil, massive magnetic assembly, and large
Alnico V magnet.
The cone is
molded in a shape which makes possible uniform wide angle didstribution of the
full low frequency range, and is coated with an exclusive damping factor
damping compound, which prevents unwanted reverberations traveling within the
cone material. An enclosure with a tuned port is employed to optimize bass
efficiency and dynamic range.
Midrange
Vocals and
midrange sounds are reproduced by a 5-inch transducer having high sensitivity
and power handling capacity. A 7/8" copper voice coil, suspended in an
intense magnetic fieldprovided by a 2,75-pound magnetic assembly energized by
an Alnico V magnet, drives the midrange transducer.
High frequency
Delicate treble fundamentals, overtones and harmonics above 6000 Hz are reproduced by a 1,4-inch direct radiator. Its 5/8" copper voice coil is unusually large in relation to cone diameter, for greatest efficiency and transient response. Suspending the outer edge of the cone assembly with an impregnated cloth and surrounding the entire dynamic structure with a ring of dense foam eliminates unwanted rediations and reflections. The smal surface of the cone and center dome is responsible for uniform high frequency dispersion.
Dividing
Network
The function
of the network is far more complex than merely diverting low and high notes to
a woofer and tweeter respectively; it wastes none of the power that should be
used to drive the loudspeakers; it precisely controls each speaker's operation
in the transition frequency range. Controls on the front of the cabinet, behind
the removable foam grille, permit
adjusting midrange and high frequency levels for greater or less audible
output in relation to the bass.
Power
handling capacity
The
specified power handling capacity indicates the continuous program level that
can be accepted by a JBL loudspeaker system without damage. Its peak power
handling capacity is considerably greater than the continuous rated value, as
reflected in the remarkable transient response of JBL loudspeaker system
components.
The L100
will produce clean sound at comfortable listening levels when driven by an
amplifier having an output of as little as 10 Watts RMS per channel.
However, for
reproduction of the full dynamic range of contemporary recordings at high
volume, a quality amplifier delivering up to 150 Watts RMS per channel will
provide optimum performance. Such an amplifier has the reserve power necessary
for accurate reproduction of transients, which can reach momentary peaks
equivalent to ten times tha average power level. In almost all cases, the
volume level generated by a JBL loudspeaker will become noticeably
discomforting to the ear before the loudspeaker can be damaged by excessive
power from the amplifier.
Enclosure
Only
furniture hardwoods, hardwood veneers, and compressed woods are used. Tight,
wood-welded, hand-fitted joints eliminate undesirable resonance and warpage. Hand-rubbed oiled walnut finish
on all four sides permits the l100 Century to be placed in either an upright or
horizontal position.
Specifications
Power
Capacity: 50 watts continuous program
Nominal
Impedance: 8 Ω
Crossover
Frequencies: 1500 and 6000 Hz
Efficiency: 78 dB Sound pressure Level at distance of
15', 1 watt input
Low
Frequency Loudspeaker
Nominal
Diameter: 300 mm (12")
Voice
Coil: 76 mm (3") edgewound copper
ribbon
Magnetic
Assembly Weight: 3,1 kg (6,75 pounds)
Flux
Density: 10,400 gauss
Sensitivity: 42 dB
Midrange
Transducer
Nominal
Diameter: 130 mm (5")
Voice
Coil: 22 mm (7/8") copper
Magnetic
Assembly Weight: 1,2 kg (2,75 pounds)
Flux
Density: 16,500 gauss
EIA
Sensitivity: 46 dB
High
Frequency Direct Radiator
Nominal
Diameter: 36 mm (1,4 ")
Voice
Coil: 16 mm (5/8") copper
Magnetic
Assembly Weight: 0,7 kg (1,6 pounds)
Flux
Density: 15,000 gauss
Sensitivity: 47 dB
Finish
: Oiled walnut
Grille Color
Options: Ultra Blue; Chocolate Brown or
Burnt Orange
Dimensions
(W x H x D): 360 c 600 x 350 mm
(14-1/4" x 23-1/2" x 13-5/8")
Weight
(shipping): 25 kg (55 lbs)