Wave interaction effects occur in many everyday situations. A number of important principles associated with these interactions can be readily demonstrated without the need for extensive and expensive equipment. Using two low‐cost speakers, it is possible to easily demonstrate the basic principle underlying active noise control by placing the speakers close together and first wiring the speakers “in‐phase” to achieve constructive wave interference and then wiring the speakers “out‐of‐phase” to achieve destructive wave interference. This setup results in a global attenuation of the sound field, making the audible effect easily discernible. The dependence of the interaction on frequency and spacing (kd) can be demonstrated by changing the frequency of the excitation signal. In addition, by separating the speakers the interaction of two waves to create a standing wave can be demonstrated, and the nodes/antinodes established can be audibly heard as the listener moves his/her ear through the field. Finally, th...