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This paper describes the acoustic characteristics of sound [s] in the cities of: Medellín and Apartadó and explores the hypothesis that the articulation of /s/ will serve to distinguish between the dialects spoken in these two areas. The study analizes 943 [s] produced by a total amount of 32 speakers. The following parameters were considered in the analysis: Center of gravity, spectral peak, standard deviation of the spectrum, skewness, kurtosis, zero crossings and harmonic-noise ratio. Results suggest that: in syllable onset [s] is more apical in Medellín and more dentalised in Apartadó. Also, Medellín’s onset [s] is more sibilant. In coda position, there is no difference between the two dialects. [ABSTRACT FROM AUTHOR]