The picture is also a historical narrative in that the three types of propulsion each had their place in the development of record players. The illustration below summarises the three methods used to couple the turntable platter to the driving electric motor. A very small voltage is thus generated which is subsequently amplified and used to drive a loudspeaker. The stylus traces the grooves and is arranged to move a magnet and a coil relative to one another. It does this by rotating the disc at a constant speed with a motor and allowing a needle (or stylus) fixed at the end of a freely pivoting tonearm to follow the groove wiggles. On replay, the turntable's job is to trace these modulations in a manufactured copy of the lacquer disc. But there are a few designer "blind spots" where a little innovation pays unexpected dividends.Īs the original, completely smooth, lacquer disc turns in the recording studio, sound signals are engraved as modulations (“wiggles”) in a spiral groove. Where "the rock meets the record", analogue discs are ultimately a precision mechanical medium and demand precision mechanisms to replay them. But that does not mean the quality of the turntable can be compromised. The central premise in developing Stereo Lab is that, by using modern digital signal processing, we can improve the quality of needle-drops. As well as looking at some major improvements which can be purchased for the price of an LP. We look at what makes them go and what makes them good.
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