The interest in achieving improved acoustical conditions in classrooms has increased in the last years. Some experiments on acoustics phenomena using smartphone applications appear in the recent bibliography. In this paper, we present a proposal for active learning about room acoustics for high school and undergraduate students. Students work on the concepts of reverberation and intelligibility through a set of activities centered on speech communication in the school. For experimental work, they use smartphone applications. At the end of the work, students would be able to suggest some actions to improve acoustic comfort in school.