To make sound waves travel through brick walls or long distances, you would typically use a device called a transducer. Transducers are devices that convert electrical energy into sound energy and vice versa. In this case, you would need a transducer that can produce sound waves with enough power and intensity to penetrate the brick walls or travel long distances.
One common type of transducer used for this purpose is a loudspeaker or a horn speaker. These devices convert electrical signals into sound waves and can produce a wide range of frequencies. By placing a loudspeaker or horn speaker near the brick wall or at the starting point of the desired sound transmission, you can generate sound waves that will propagate through the wall or travel over long distances.
It's important to note that the effectiveness of sound transmission through brick walls or over long distances depends on various factors, such as the thickness and composition of the wall, the power and frequency range of the transducer, and the surrounding environment. In some cases, additional equipment or techniques may be required, such as using specialized transducers, amplifiers, or acoustic treatments to enhance sound propagation.