Class D PWM switching power amplifiers use an LC filter at the output to filter out the switching harmonics:
Other than the inductance value, what properties are important for this inductor? What types, specifically, are best?
Concerns would include distortion (from hysteresis/saturation of the core?), efficiency, EMI (toroidal shape, shielding), etc.
I think some of the important qualities would also be shared by inductors in switch-mode power supplies.