Concerto (1969-77)

The Concerto, released in 1969, was KEF’s latest high quality three-way loudspeaker system. It maintained the KEF practice in high end systems of using a dedicated midrange driver to cover the critical vocal range, in this case the newly developed 5” bextrene coned B110. Together with the new T27 ¾” melinex domed tweeter and the established B139 bass driver, it offered full range reproduction with low distortion, high power capacity and wide dispersion.
 
Intended for professionals and serious enthusiasts, the Concerto became a major success and remained in production until 1977 when it was superseded by the Cantata.
 
Specification: Concerto
System type: Three-way, floor standing
Enclosure type: Reflex
Size: 28 x 17 x 12 inches (711 x 432 x 305 mm)
Weight: 50 lb (22.7kg)
Input impedance: 8 ohms
Power rating: 30W
Crossover frequencies: 400, 3500Hz
Frequency range: 30-30,000Hz
System: A6614
Drive units: B139 bass unit (A6171), B110 midrange unit (A6362), T27 tweeter (A6340)
Crossover: A6606
System: SP1005
Drive units: B139 bass unit (A6171), B110 midrange unit (A6362), T27 tweeter (A6340)
Crossover: SP1002
System: SP1006
Drive units: B139 bass unit (A6171), B110 midrange unit (SP1003), T27 tweeter (SP1032)
Crossover: SP1004
 
Download C Series 1970 Brochure
Concerto Installation Instructions