The speech intelligibility of /C-v/ and /C-v-C/ syllables spoken under conditions of conversational and clear speech was compared. Six female adults were recorded while they produced four iterations of the stimulus set in each of the two speaking conditions. The recorded stimuli were randomized and presented to 12 subjects under three conditions: visual-only, auditory-only and auiovisually. Noise was mixed with the signal for the latter two conditions. The results were revealed a significant within and across talker variability in speech intelligibility. Also, a clear speech effect was observed in all three sensory modalities.