KEF 103 (circa 1981)

Documentation on the KEF 103 is thin, but what survives is genuine. The model turns up in two period sources - a KEF advertisement and a magazine review - and together they sketch a compact Reference Series loudspeaker from the early 1980s. Driver sizes, crossover points, price and production years are not documented in the materials on hand.

KEF's own advertising, running in Audio (September 1981, p.15), made a confident claim: buyers might find a larger speaker at the same price, but not a better one. The ad pointed to the 103's 19-litre cabinet, its drive units and filter networks, and the "unique KEF electronic overload protection circuit" - S-STOP. The HiFI-Stereo review (July 1981, p.52) explained how that circuit worked. It was powered by the audio signal itself. It watched for instantaneous program peaks that could damage the tweeter, and for the integrated long-term power input that could overheat the voice coil. The same review's measurements found the high-frequency output rising steadily from 4,000 Hz to its maximum right at the 20,000 Hz measurement limit. Close-miked woofer response peaked around 100 Hz and fell away on either side.

The review also compared two pairs of the 103 through a comparator switch. They did not sound identical, the reviewer noted - but they were so similar that he had to check which pair was actually playing. KEF was claiming that kind of consistency with its Reference Series badge.

That is about the whole surviving record: a compact, protected, carefully matched Reference two-way from KEF's early-1980s lineup. Deeper specifications and history, if they exist, have not turned up in the Archive's research.