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





KEF Model 103.2 loudspeakers

Two way bookshelf loudspeaker
KEF Electronics RS Model 103.2 2-way bookshelf loudspeaker is said to use a 20 cm low-frequncy driver that is mechanically isolated from its enclosure to reduce the transference of inertial forces and thereby greatly reduce coloration caused by cabinet resonance. Electrical compensation is also used to improve efficiency and provide highpass signal filtering. Electronic overload protection is in the form of an automatic self-powered device called S-Stop, which is an acronymm for Steady static and Transient Overload protection. Because this protective device is so effective, the Model 103.2 is conservatively rated at 150 watts.

KEF 103.2 features:
Flat frequency response of direct sound
Minimum inter-unit time delay
Unique bass loading technique giving higher efficiency and greater power handling capacity than conventional systems
Electronic overload protection
Computer matching of component parts and drive units.
Sound Quality
KEF speakers are known the world over for their smooth, natural sound and capacity for reproducing fine detail. Their refined performance is due to a combination of unusual diaphragm materials, crossover design and careful assembly methods.. The Model 103.2 for instance is equipped with two drive units, both of which employ special plastic diaphragms and a computer designed dividing network. The intricate design procedures which KEF developed in the early seventies have been applied to every vital feature of the new speaker.
The resulting sound possesses a transparent airy quality which constantly dlights the ear and never causes listener fatigue. The precise matching of speaker pairs produces convincing stereo images of great depth and sharpness.

Bass Loading
Model 103.2 possesses some important new features which improve bass and lower mid range reproduction. The chassis of the 200 mm low frequency driver is mechanically isolated from its enclosure to reduce the transference of inertial forces and thereby greatly reduce colouration from cabinet resonance.
Electrical compensation is also incorporated in the dividing network to improve efficiency and provide high-pass signal filtering.

Electric Overload protection
The widespread use of high powered amplifiers has made it necessary to protect loudspeakers against accidental overload. KEF pioneered electronic overload protection for professional monitoring loudspeakers in the sixties and more recently developed a completely automatic self-powered device called S-STOP ( Steady State and Transient Overload Protection).
S-Stop is the most comprehensive, practical and effective protection circuit in use. It guards thermal overload, woofer over-swing and voltage surges. Immediately any sale limit is exceeded the input level is reduced by means of a relay-operated attenuator. Because S-STOP is so effective Model 103.2 conservatively rated at 150 watts.
Specifications
Frequency Range:  60 Hz - 20,000 Hz ±2 dB (at 2m on design axis)[-10 dB at 37 Hz and 30 kHz]
Directional Characteristics (within 1 dB of response on design axis):
Up to 20,000 Hz :  ±5° Vertically
Up to 10,000 Hz :  ±20° Horizontally
Sensitivity Level:  86 dB SPL (anechoic condition, at 1W/1m)
Maximum Output:  106 dB SPL (on programme peaks under typical listening conditions)
Distortion Second Harmonic:
20 Hz to 150 Hz :  less than 2%
150 Hz to 20 kHz :  less than 1%
Distortion Third Harmonic:
20 Hz to 50 Hz :  less than 2%
50 Hz to 20 kHz :  less than 1%
Enclosure:  10 liters
Power Handling Capacity:
Programme Rating :  150 W
Max. Continuous Sinusoidal Input :  20 V RMS, 100 Hz - 2,5 kHz 9falling to 8 V RMS from 4 kHz - 20 kHz)
Electronic protection S-STOP:  the system is protected against any continuous or intermittent fault conditions which produce input signals not greater than 60 V peak from DC to 50 kHz
Nominal Impedance:  8 Ω
Finishes:  Choice of walnut, teak, rosewood and black ash veneers with blac or brown grille fabric as appropriate.
Dimensions (W x H x D):  265  x 510 x 240 mm
Weight:  8,6 kg (19 lbs)

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