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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 Calinda SP1053


The Calinda three-way loudspeakers are among the first KEF model to benefit from the technological innovations introduced by the Company during the early and mid 1970s - in particular the application of computer-based test methods in both design and quantity production and the use of the "Target Function Concept" in the synthesis of crossover networks. These advances have made it possible to produce loudspeakers in the domestic size and price range with a standard of performance hithero associated with professional equipment. Like most other loudspeaker, Calinda have been designed to meet aesthetic requirements imposed on them as articles of furniture, and as a result, the outward appearance shows no sign of their special technical features. 

Howev, with the grille covers removed, as shown above, certain differences in the type and positioning of the drive units, and it will also be noticed that in Calinda and largest KEF Cantata, the conventional placing of the mid-range and high-frequency units is reversed.
These features, the reason for which may not be immediately clear, are in fact part of an overall system-engineering approach, in which the various components of each model - drive units, enclosures and filter networks - are developed together and optimised to fulfil a particular need; both designs are based on practical considerations of performance and cost-effectiveness, avoiding the kind of over-specification that may look impressive on paper but is irrelevant to the listeners requirements.
 

Calinda was an 8 inch two-way system with an auxiliary (passive) radiator augmenting the low frequency response. This format was used previously in the Cadenza and Reference 104. In the Calinda system the driver layout was adjusted to allow an elegantly slim floor standing cabinet. 

Specification:  Calinda
System Type:  Two-way, floor standing
Enclosure Type:  Passive radiator
System:  SP1053
Drive Units:
Bass Unit : B200 (SP1054),
Passive Radiator :  BD139 (SP1042),
Tweeter :  T27(SP1032)
Crossover:  SP1055
Input Impedance: 8  Ω
Rated Maximum Power:  100 W programme
Amplifier Requirements:  15 - 100 watts per channel into 8 Ω
System Resonance:  28 Hz, mechanical reflex
Frequency Range:  40 - 30,000 Hz, ±3 dB
Sensitivity:  12.5 watts for 96 dB at 1 m and 400 Hz in anechoic conditions
Crossover Frequency:  3,500 Hz
Internal Volume:  45 litres
Finishes:   Walnut or Teak
Grille:  Mokka brown cloth
Dimensions (W x H x D):  700 x 280 x 350 mm (27.5" x 11" x 13.8")
Weight:  19.1 kg (42 lb)

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