K1 Slimline (approx. 1961-66)

The K1 Slimline was the first loudspeaker from KEF. As its name suggests, this was the compact form of the K1 monitor for use where space was a premium. Incorporating the same driver innovations as the monitor: 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 - all housed in an enclosure less than 5 inches deep.
 
To minimise tonal colourations the enclosure was substantially braced with the wall panels damped with bituminous pads and finished in Walnut with a coffee fleck grille.
 

Specification: K1 Slimline

System type: Three-way, floor standing
Enclosure type: Closed box (acoustic resistance)
Size: 27 x 17 x 6.75 inches (680 x 430 x 170 mm)
Weight: 46 lb (21 kg)
Input Impedance: 8-15 ohms
Maximum input power: 25W rms, 50W peak
Drive units: B1814 bass unit, M64 Midrange, T15 tweeter