What is stereo?

There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.

H.H. Scott '59

JBL L-50

 JBL's newest tree-way bookshelf loudspeaker is a happy blend of the ideal and the attalnable. Here's how they met.
We built a superb system called the l212. it's an absolutely no-trade-off, state-of-the-art., $1,700 system that hasredefined the upper limits of hogh performance sound.
Wouldn't it be great if we could build a loudspeaker that would sound as expensive but wouldn't be. The answer's the L50. you can take a pair home for $550. but before you do that, turn them on. The sound is everywhere. No matter which way you turn you're in the center of the music. Here's what's heppening to you.
You're learning the new geometry of sound. The third dimension: Bass guitar, left front. Saxophone behind. Drums deep in the middle. Lead guitar front right. Flute behind. And the sound is never altered, colored non caricatured.
The silent hero of the L50's smooth, seamless sound is the best crossover network you can buy - the same kind we put into our studio monitors. You owe it to your soul to hear the L50's. and be sure to ask for them by their first name: JBL. That guarantees you'll get the same craftsmanship, the same components, the same sound heard in leading recording studios and concert halls, around the world.  Come hear the L50's, come see what it's like to get close to perfect.
 The precise vertical alignment of the transducers insures near perfect stereo imaging.
System Components:
Low Frequency Driver :  127A
Nominal Diameter:  250 mm (10 ")
Voice Coil:  50 mm (2") copper
Magnetic Assembly Weight:  1,1 kg (2,5 lb)
Flux Density:  0,85 tesla (8500 gauss)
Sensitivity:  88 dB SPL
Cone Kit:  C8R127A
Impedance Nominal:  8 Ω
Dynamic Test Input:  5 V
Sweep Frequency:  30 - 1200 Hz
D.C. Resistance:  4,8 Ω (minimum); 5,6 Ω (max.)
Gap Gauge:  ,044"
Mid Range Driver :  LE5-10
Nominal Diameter:  130 mm (5 :)
Voice Coil:  22 mm (7/8")
Magnetic Assembly Weight:  0,74 kg (1-3/8")
Flux Density:  1,4 tesla (14,000 gauss)
Sensitivity:  91 dB SPL
Cone Kit:  C8RLE510
Impedance Nominal:  8 Ω
Dynamic Test Input:  4 V
Sweep Frequency:  75 - 3000 Hz
D.C. Resistance:  4,9 Ω (minimum); 6,1 Ω (max.)
Gap Gauge:  ,040
High Frequency Driver :  LE26
Nominal Diameter:  36 mm (1-1/2")
Voice Coil:  16 mm (5/8")
Magnetic Assembly Weight:  0,74 kg
Flux Density:  1,5 tesla (15,000 gauss)
Sensitivity:  91 dB SPL
Diaphragm Kit:  D8RLE26
Impedance Nominal:  8 Ω
Dynamic Test Input:  3 V
Sweep Frequency:  500 - 1200 Hz
D.C. Resistance:  3,4 Ω (minimum); 4,3 Ω (max.)
Gap Gauge:  ,029"
Systems Specifications
Nominal Impedance:  8 Ω
Max. Recommended Amp Power:  70 watts
Crossover Frequencies:  800 Hz, 3000 Hz
Sensitivity:  88 dB (1 W at 1 m)
Enclosure Dimensions (W x H x D): 362 x 622 x 314 mm (14-1/4" x 24-1/2" x 12-11/32")
Shipping Weight:  21 kg (47 lbs)
Finish/Grille  :  Oiled, Walnut / Blue, brown, rust

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