KEF is a British loudspeaker manufacturer. Founded in 1961, KEF was known for manufacturing BBC-designed monitor speakers. In the 1970s, it was one of the highest regarded loudspeaker manufacturer.


In the 1970s, KEF was the first company to adopt computers for the testing and design of loudspeakers, leading to the "Total System Design" methodology and more sophisticated production techniques such as driver pair matching. The radical Model 105 system, released in 1977, embodied this new philosophy and was one of the most highly regarded loudspeakers of its time.
In the 1970s and 1980s, KEF, Bowers & Wilkins, and Celestion were the "big three" British loudspeaker brands. The brand has gone downmarket since.


KEF have brought to the market a number of significant technologies:
  • Driver Dcoupling: reduces cabinet coloration by mounting drivers via controlled lossy coupling (Model 105.2, 1979)
  • Coupled-Cavity Bass Loading: pairs two bass drive units and feeds their output via a single port (Model 104/2, 1984)
  • Conjugate Load Matching: a crossover optimization that presents a constant and low ohmic load to the amplifier (Model 104/2, 1984)
  • KEF Universal Bass Equaliser (KUBE): a technique to overcome the phase lag present at low frequencies (Model 107, 1986)
  • Uni-Q: placing the midrange and tweeter drivers to preserve phase integrity and match dispersion between the drivers (C-Series, 1988)


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