The following figure shows the structural components of the speaker:

Figure 30.1: 3D Model of the Speaker Assembly

Components include the cone, surround, spider, frame, magnet, and voice coil. A 1/4 symmetry model is used. The air inside the cabinet is ignored.

As shown in the following figure, the acoustic fluid elements are outside of the cabinet:

Figure 30.2: Acoustic Fluid Elements

Perfectly matched layer (PML) elements are used on the outermost region to absorb outgoing acoustic waves.