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K1 MONITOR (APPROX. 1962-66)
One of Raymond Cooke’s primary aims when founding KEF was to produce a high quality three-way loudspeaker system. The K1 utilised all the key innovations of the new company: the B1814 woofer with its flat rectangular diaphragm of aluminium skinned polystyrene, the M64 elliptical midrange unit with similar diaphragm construction, and the T15 tweeter with its hemispherical diaphragm of  Melinex. These were housed in a 110 litre enclosure, which allowed the bass driver to perform to its maximum, reproducing bass down to 20Hz and bringing recordings to life with a great sense of realism. The system was intended for professionals and serious enthusiasts and did much to establish the technical credibility of the KEF brand.
To minimise tonal colourations the enclosure was substantially braced with the panels damped with bituminous pads, and finished in a choice of American Walnut, Teak or Sapele with a coffee fleck grille.
Specification: K1 Monitor
System type: Three-way, floor standing
Enclosure type: Closed box (acoustic resistance)
Size: 39.5 x 17 x 14 inches (1000 x 430 x 350 mm)
Weight: 80 lb (36 kg)
Input impedance: 8-15 ohms
Maximum input power: 25W rms, 50W peak
System resonance: 28Hz
Frequency range: 20-18,000Hz
Drive units: B1814 bass unit, M64 Midrange, T15 tweeter