With the following research, we intend to demonstrate the pertinence of correlating the phonetic parameter "tongue position" with the sociolinguistic variable "sociocultural stratum". We focused our work on the age group between 18 and 25 years old because that segment shows a greater awareness of the linguistics norms and, consequently, they make a clearer distinction between what is considered prestigious and stigmatized. We believe that this work is a contribution to the sociophonetic studies of the Spanish spoken in Chile in two ways: 1. In the phonetic aspect, it gives information about the allophones in the vowel inventory of the Spanish spoken in Chile 2. In the sociolinguistic aspect, it accounts for the relevance of using the notions of status and stigmatization for not only the consonant inventory -as the researches have done so far- but the vowel inventory also.