This study aims to acoustically characterize the Portuguese spoken in the Amazon/Pará, focusing unstressed medium vowels of language variety spoken in Barcarena/PA. This research is linked to the Norte Vogais project, part of PROBRAVO, which has as one of its goals acoustically analyze the unstressed vowel system of Brazilian Portuguese (BP) spoken in the state of Pará. Total corpus is formed by 18 (eighteen) speech samples of native informants from Barcarena/PA, socially stratified for sex (male and female), age group (15-25 years, 26-45 years and above 45 years) and level of education (elementary, middle, and upper). In the whole, 818 occurrences were analyzed, being 411 front vowels and 407 back vowels. Data were obtained from the reading of a text about football, whereby the selected informants produced 53 words containing the vowels in pretonic position. In data processing, measures of F1 and F2 (Hz) of the target vowels were taken. Thus, we present preliminary aspects of the behavior of middle unstressed vowels in the language variety spoken in Barcarena/PA. It was found, from the analysis undertaken, that speakers of the studied range give preference to the maintenance of middle vowels, similar to that found in variationists researches made by the members of Norte Vogais project. In addition, it was found that, in case of front vowels, the high variant occupies almost the same acoustic space occupied by the medium closed and the two variant maintains a large distance from the medium open in the female speech. In the case of the back vowels, they occupy very different acoustic spaces in female speech. In contrast, in the male speech, the variants of front vowels occupy very different acoustic spaces and the high variant and the closed of front vowels are very similar and significantly distant from the medium open variant. A tendency to centralization of vowels was also observed.
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