How does the sound wave reach bryony from the stereo system?

The sound wave is generated by the stereo system's speakers, which convert electrical signals into mechanical vibrations that create sound waves in the air. These sound waves travel through the air as longitudinal waves, which cause particles in the air to vibrate back and forth. When the sound waves reach Bryony, they enter her ear canal and cause her eardrum to vibrate, which is then transmitted through the middle ear to the cochlea where it is converted into electrical signals that are sent to the brain for interpretation.