Corelli, Calinda and Cantata (1976-81)

During the early and mid 1970s KEF was the first company to utilise computers in the design and analysis of loudspeakers. The design process that flowed from this was termed ‘Total System Design’ where the final performance of the speaker was seen as the combination of drivers, cabinet and crossover all working together to produce the target acoustic response, with computers being used throughout for simulations and analysis. The Corelli, Calinda and Cantata represented the first application of this methodology in the mid priced sector.
 
Corelli was an 8 inch two-way closed box system that built on the success of the Chorale. The developments included a new version of the B200 bass unit and an improved cabinet. 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. Cantata was a three way closed box design using the famous B139 ‘racetrack’ bass driver, a new version of the B110 bass/midrange unit and the new T52 tweeter - the latest development of the proven T15. In the Cantata system the driver layout allowed a slim frontal aspect ratio, demonstrating how acoustical and industrial design was developing through the 1970s.
 

Specification: Corelli
System type: Two-way, bookshelf/stand-mount
Enclosure type: Closed box
Size: 470 x 280 x 220 mm (18.5 x 11 x 8.6 inches)
Weight: 9kg (20 lb)
Input Impedance: 8 ohms
Rated maximum power: 50W programme
Amplifier Requirements: 25-50 watts into 8 ohms
System resonance: 58Hz, Q=1.1
Frequency response: 50-30,000Hz +/-3dB
Sensitivity: 19 watts for 96dB at 1m and 400Hz in anechoic conditions
Crossover Frequency: 3500Hz
Finishes:  Walnut or Teak
Grille: Mokka brown cloth
System: SP1051
Drive units: B200 bass unit (SP1063), T27 tweeter (SP1032)
Crossover: SP1052
 

Specification: Calinda
System type: Two-way, floor standing
Enclosure type: Passive radiator
Size: 700 x 280 x 350 mm (27.5 x 11 x 13.8 inches)
Weight: 19.1kg (42 lb)
Input Impedance: 8 ohms
Rated maximum power: 100W programme
Amplifier Requirements: 15-100 watts per channel into 8 ohms
System resonance: 28Hz, mechanical reflex
Frequency range: 40-30,000Hz +/-3dB
Sensitivity: 12.5 watts for 96dB at 1m and 400Hz in anechoic conditions
Crossover Frequency: 3500Hz
Finishes:  Walnut or Teak
Grille: Mokka brown cloth
System: SP1053
Drive units: B200 bass unit (SP1054), BD139 passive radiator (SP1042), T27 tweeter (SP1032)
Crossover: SP1055
 
 
Specification: Cantata
System type: Three-way, floor standing
Enclosure type: Closed box
Size: 81.5 x 34 x 39.2cm (32.1 x 13.4 x 15.4 inches)
Weight: 31.7kg (70 lb)
Input Impedance: 8 ohms
Rated maximum power: 150W programme
Amplifier Requirements: 15-150 watts per channel into 8 ohms
System resonance: 38Hz, Q=0.7
Frequency range: 35-20,000Hz +/-3dB
Sensitivity: 8 watts for 96dB at 1m and 400Hz in anechoic conditions
Crossover Frequencies: 250 and 3000Hz
Finishes:  Walnut or Teak
Grille: Mokka brown cloth
System: SP1056
Drive units: B139 bass unit (SP1044), B110 bass unit (SP1057), T52 tweeter (SP1049)
Crossover: SP1058 and SP1064