Welcome to the Knowles Using Dynamic Speakers and Balanced Armature Drivers in In-Ear Wearables product training module. This presentation will describe the construction of dynamic speakers and Balanced Armature drivers and show the difference between vented and unvented Balanced Armature drivers. It will discuss the volume requirements for dynamic speakers and both vented and unvented Balanced Armature drivers, and analyze the driver power requirements with both standard and class-D amplifiers.