The present investigation in acoustic properties of tones in Slovenian addresses vowel duration, intensity and fundamental frequency. Although no statistical differences between both lexical tones (or pitch-accents) were found in the first and second variable, the third was found highly significant. The results differ greatly from what was previously established. Roughly, the tone is Low on the stressed and High on all post-tonic syllables, in the first lexical class. In the second, the situation is vice-versa, such that the stressed vowel is High in tone and the rest of prosodic word is Low.