From coil to sound: Teaching electroacoustics through speaker construction

This demonstration engages students in electroacoustic principles through the design and construction of working loudspeakers. Using a scaffolded approach, the demonstration progresses through three interconnected activities that build conceptual understanding of dynamic speaker design. Students can first explore magnetic induction using coils to observe how magnets and mechanical motion generate electrical current. The students then construct simple paper speakers that demonstrate how these electromagnetic principles produce sound. Finally, students examine more sophisticated speakers with proper enclosures and advanced circuitry to understand complete audio system design. This progressive demonstration sequence allows students to connect abstract electromagnetic concepts with tangible audio applications. The activities are adaptable for multiple age groups but are specifically designed for non-major physics of sound courses. Complete lesson plans, student assignments, and assessment materials accompany the demonstrations, to provide instructors context for implementing these demonstrations.