This study examined the impact of auditory input enhancement on the speaking abilities of Iranian EFL learners. Given the importance of speaking in language acquisition and the challenge of limited exposure to spoken English, the study focused on auditory input enhancement—altering intonation and pitch—to improve speaking proficiency. Fifty intermediate-level female learners, aged 18-28, from an English Language institute were selected based on their Oxford Placement Test (OPT) scores. Participants were divided into an experimental group, which received auditory input enhancement, and a control group, which followed traditional methods. Speaking abilities were evaluated with pretests and posttests using the Preliminary English Test (PET). An independent samples t-test analyzed the scores to test the hypothesis. Results indicated a statistically significant improvement in the experimental group's speaking performance compared to the control group, with Cohen's d showing a large effect size. These findings support previous research on input enhancement, underscoring the role of auditory input in focusing learners' attention on linguistic features and enhancing speaking performance. The study suggests that auditory input enhancement could be a valuable tool for EFL teachers and curriculum designers to improve learners' speaking skills.
