Combining physics to simulate the resulting acoustic output.
The acoustic analysis is performed using the following physics:
Solid and Shell mechanics (for the diaphragm and voice coil)
Electrical Circuit (for lumped parameters)
Solid-Shell connection (for the diaphragm and voice coil)
Acoustic-Structure boundary x2 (couples the diaphragm and voice coil to the air)
The lumped motor of the speaker couples the voice coil impedance as well as the (static) BL value found in the magnetic study to the force on the voice coil in the mechanical study using the relation
Force = BL*i
Feedback to the motor is ensured via the voltage source with the voltage defined as BL*v0, with v0 being the voice coil velocity.