The purpose of this study is to evaluate the effects that objective and subjective changes in the voice of participants who took part in a voice training course have on their confidence, self-esteem and positivity. The training was conducted on 83 adult learners, enrolled voluntarily in the “Voice Training” course delivered by the A institute and done in small groups of 3 to 5 people during 8 sessions of 120 minutes each (1-2 sessions a week). Out of these, 60 people were selected for analysis. In order to objectively measure the results of voice training, voice analysis was carried out with the help of the Praat voice analysis software, before and after the participants’ training. In addition, a structured questionnaire was given to the participants, before and after training, to get their subjective views on their voice, confidence, self-esteem and positivity. The SPSS 18.0 program was used to analyze this statistical data. Lastly, the reactions of the participants were collected after the experiment in order to conduct a qualitative analysis on the perceived influence of the changes in their voice when it comes to confidence, self-esteem and positivity. Results show that after the voice training course both objective voice analysis figures (Jitter, Shimmer, NHR) and subjective voice evaluations improved as did the participants’ perceived confidence, self-esteem and positivity. These changes were found to be independent of sex, age, occupation, motives for participating in the course and geographic location.