JBL L 112 loudspeakers

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)