Around 1976 I built a set of KEFKIT 3 speakers. These were based on the highly regarded KEF CONCERTO speakers from the late 60s/early 70s. The Concerto was a vented speaker box of 62 litres (64 pounds weight), fitted with three drive units - the T27 (high frequency), B110A (mid) and B139 (low). I built it according to my own specifications with cladding to match furniture in the room.

My interest in KEF speakers was renewed around 1999 when I upgraded the speakers with new crossover units, internal wiring, and spikes.

In 2002 I finally realised that what KEF had built in the 1970s could be made to match the performance of any reasonably priced speaker system being developed today. I also realised that many enthusiastic audiophiles across the world are still seeking information about the KEF systems of the 1970s to improve their existing KEF speakers, repair their speakers or to design and make their own speaker systems using 1970s components.

I also became increasingly aware that KEF drive units are at the 'heart' or many of the most sought after speaker systems from the 1980s and 1990s including the Linn Isobarik and the BBC LS3/5a.

The main purpose of this site is to act as a focus for all interested enthusiasts and users of KEF drive units and other components which were first developed in the late 1960s through to the early 1980s.