KEF Concerto

 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and serious enthusiasts, the Concerto became a major success and remained in production until 1977 when it was superseded by the Cantata.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