Concord (1966-72)

The Concord, released in 1966, replaced the Duette and Duette deLuxe models. Employing the Mk2 B139 and T15 drive units – skilfully blended by a sophisticated printed circuit board crossover network to give smooth coverage of the entire audio range. The bass reproduction was impressive from such a small enclosure affording comparison with much larger and more expensive systems.
 
The Mk2 version of the T15 further refined its performance, free from stridency and able to reproduce massed strings and soprano voices with beguiling translucency. Great care was taken in obtaining the correct tonal balance with frequent comparisons with high-grade monitor speakers at every stage in its development.
 
Many otherwise fine loudspeakers at the time were ruined by their grille fabrics, which upset the frequency response and introduced objectionable colouration. In other cases the appearance was soiled by the obtrusion of the ‘works’, which are seen through the grille. KEF researched this problem and the result was the very attractive frontal design of the Concord. The double-layered construction employed a special kind of foam material, to precise specification, in conjunction with a highly decorative and durable anodised aluminium mesh. This combination introduced no detectable colouration, and at the same time remained visually opaque.  
 
The cabinet was finished in selected hardwood veneers with a choice of French Walnut or Burma Teak, with the Lustre black metal grille and trim bars.
 
Specification: Concord
System type: Two-way, floor standing
Enclosure type: Closed box
Size: 24 x 15 x 9.8 inches (610 x 381 x 249 mm)
Weight: 37 lb (16.8kg)
Input impedance: 8-16 ohms
Maximum input power: 15W rms, 30W peak
System resonance: 45Hz
Frequency range: 30-20,000Hz
Input connections: Terminals
System: A6243
Drive units: B139 bass unit (A6171), T15 tweeter (A6236)
Crossover: A6305