The introduction in 1970 of the B200 class of bass drivers with an 8 inch doped bextrene cone allowed a useful expansion of the KEF speaker range, being used straight away in the C-Series models Chorale, Cadenza and Cantor.
Cadenza (1970-76)
The Cadenza combined a B200 with the established T27 tweeter and BD139 passive radiator in a 45 Litre design, a format that was later developed into the Reference 104. Although relatively compact the Cadenza was suitable for use in larger rooms and was capable of fundamental tones down to 30Hz. This was achieved by means of the acoustically coupled passive radiator, which worked in conjunction with the bass driver to enhance the bass output.
Chorale (1970-79)
The Chorale paired a B200 with the established T27 tweeter in a 20 Litre closed box design, which became an instant success and KEF’s new best selling product. It combined an extended high frequency response with a natural, uncoloured midrange and a full round, bass - quiet and delicate or complex and heavy music being handled with equal ease. The success of the Chorale ensured that it remained in production until 1979.
Coda (1971-77)
The Coda was developed from the ground breaking Cresta design with some useful design elements to provide excellent acoustical performance in an economic package. Its accurate, wide frequency response made it ideal for high quality stereophonic systems in small to medium sized rooms and the dimensions allowed convenient installation in the new, but short lived, quadrasonic format.
Cantor (1971-78)
The Cantor paired a B200 with the established T27 tweeter in a 10 Litre closed box design, and was a shallow box version of the Chorale for shelf mounting.
Specification: Cadenza
System type: Two-way, stand-mount/floor standing
Enclosure type: Passive radiator
Size: 597 x 362 x 299cm (23.5 x 14.25 x 11.75 inches)
Weight: 15kg (33 lb)
Input Impedance: 8 ohms
Rated maximum power: 30W programme
Amplifier Requirements: 15-30 watts per channel into 8 ohms
System resonance: 35Hz, mechanical reflex
Frequency range: 30-40,000Hz
Crossover Frequency: 3500Hz
Finishes: Walnut, Teak, White
Grille: Brown Grey, Beige
System: SP1024
Drive units: B200 bass unit (SP1022), BD139 passive radiator (SP1023, 1037 or 1042), T27 tweeter (SP1032)
Crossover: SP1019
Specification: Chorale
System type: Two-way, bookshelf/stand-mount
Enclosure type: Closed box
Size: 470 x 280 x 220 mm (18.5 x 11 x 8.7 inches)
Weight: 7.5kg (16.5lb)
Input Impedance: 8 ohms
Rated maximum power: 25W programme
Amplifier Requirements: 15-25 watts per channel into 8 ohms
System resonance: 55Hz
Frequency range: 35-40,000Hz
Finishes: Walnut, Teak, White
Grille: Brown Grey, Beige
System: SP1016
Drive units: B200 bass unit (SP1014), T27 tweeter (SP1032)
Crossover: SP1015
Specification: Coda
System type: Two-way, bookshelf
Enclosure type: Closed box
Size: 330 x 230 x 146 mm (13 x 9 x 5.75 inches)
Weight: 5kg (10.4 lb)
Input Impedance: 8 ohms
Rated maximum power: 20W programme
Amplifier Requirements: 15-20 watts per channel into 8 ohms
System resonance: 60Hz
Frequency range: 50-40,000Hz
Crossover Frequency: 3500Hz
Finishes: Walnut, Teak, White
Grille: Brown Grey, Beige
System: SP1034
Drive units: B110 bass unit (SP1003), T27 tweeter (SP1032)
Crossover: SP1035
Specification: Cantor
System type: Two-way, bookshelf
Enclosure type: Closed box
Size: 47 x 28 x 12cm (18.5 x 11 x 4.75 inches)
Weight: 6.15kg (13.5lb)
Input Impedance: 8 ohms
Rated maximum power: 25W programme
Amplifier Requirements: 15-25 watts per channel into 8 ohms
System resonance: 70Hz
Frequency range: 45-40,000Hz
Crossover Frequency: 3500Hz
Finishes: Walnut, Teak, White
Grille: Brown Grey, Beige
System: SP1033
Drive units: B200 bass unit (SP1014), T27 tweeter (SP1032)
Crossover: SP1036