J.B. lansing claims
that these L112 bookshelf loudspeaker system are of "state-of-the-art." 3-way
design, partly beacuse they are designed as "mirror-imaged pairs".
The L-112 features a new 1-inch dome radiator, a 5-inch midrange speaker and a
12-inch low frequency transducer. A new, high-resolution dividing network
provides smooth transition between the drivers, controlling each throughout its
entire operating range. The woofer utilizes JBL's unique Symmetrical Field
geometry flux-stabilized magnetic structure ; it delivers deep, extended low
frequency response according to JBL. A powerful magnet weighing more than 10
pounds and a 3-inch copper edge wound voice coil contribute to high power handling
capability, low distortion and "outstanding" transient response. The
midrange is housed in an isolated subchamber to prevent interaction with the
low frequency driver. A new dome radiator is said to reproduce the highest
harmonics with power and clarity.
The system's
enclosure measures 21-1/2 inches by 14-1/4 inches by 13 inches, and is
constructed of dense compressed wood panels veneered in American black walnut
and lined with fibreglass to absorb unwanted resonances. The speaker can be driven by any amplifier
delivering from 10 to 300 watts continuous sine wave per channel.
new Dome Radiator
Designed
specifically for the L112, the new high frequency dome radiator has the
extraordinary ability to acurately reproduce the highest harmonics - the
subtlest shadings of music - with depth.
Yet it clenly handles the loudest musical peaks with authority. In developing
this transducer, we utilized the capabilities of our fully equipped
laser-optics laboratory. Highly detailed holograms (three-dimensional
photographs) allowed us to study diaphragm motion and identify flaws that would
have otherwise gone undetected (much the way X-rays aid a doctor). The
high-frequency dome of the L112 is formed of a lightweight phenolic material,
coated with aluminum by means of a vaper deposition process. The dome has the
optimum combination of strength, mass, and rigidity, and a copper voice coil
drives it over the full circumference for smooth, low-distortion response acros
its entire wide operating range.
SFG - Cleaner, More
Powerful Bass
The 300 mm 912 in)
low frequency transducer of the l112 utilizes JBl's unique SFG (Symmetrical
Field Geometry) magnetic structure to produce deep, powerful, clean bass. The
SFG innovations - the symmetrical magnetic field at the voice coil gap and the
aluminum Flux Stabilizing Ring - dramatically reduce the second harmonic
distortion found in conventional drivers. A powerful magnet and large 75 mm (3
in) voice coil give the driver high power-handling capability, further
reduction of distortion, and outstanding transient response. The thick white
coating on the cone is an exclusive JBL, formulation that gives the cone the
optimum mass and stiffness for flatest frequency response.
Specifications
Max. Recommended
Amplifier Power: 300 watts per channel
Nominal
Impedance: 8 Ω
Crossover
Frequencies: 1,2 kHz, 3,7 kHz
System
Sensitivity: 89 dB SPL, 1 W/1 m
Low Frequency Driver
Nominal Diameter
: 300 mm (12")
Voice Coil : 76 mm (3") copper
Magnetic Assembly
Weight: 4,7 kg (10,25 lb)
Flux Density: 1,05 tesla ( 10,500 gauss)
Sensitivity : 89 dB SPL
Midrange Driver
Nominal Diameter
: 130 mm (5")
Voice Coil : 22 mm (7/8") copper
Magnetic Assembly
Weight: 0,74 kg (1,62 lb)
Flux Density: 1,4 tesla ( 14,000 gauss)
Sensitivity : 91 dB SPL
High Frequency Dome
Radiator
Nominal Diameter
: 25 mm (1")
Voice Coil : 25 mm (1") copper
Magnetic Assembly
Weight: 0,9 kg (2 lb)
Flux Density: 1,4 tesla ( 14,000 gauss)
Sensitivity : 89 dB SPL
Finish/Grille
Colors: Oiled walnut / brown
Dimensions (W x H x
D): 622 x 362 x 333 mm (24-1/2" x
14-1/4" x 13")
Weight
(shipping): 25 kg (55 lb)