Completely different beasts from audio amps.
Industrial VFD's are putting out high DV/DT Switched pulses going typically 650V or more p-p (on 460V supplies), with absolutely no output filtering. This creates a horrendous EMC environment **. Screened cables on the output are mandatory, and careful routing of all IO is needed as well as screening on such cables. Under EU regs, due to the EMC class, it is illegal to sell them for consumer installation. It is mandated that they are installed by "qualified" engineers.
Audio gear is nothing like this. Even class D amplifiers which (superficially) work in a similar way are
1 - switching much lower voltages (<10%)
2 - Have output filters that reduce that square wave at the output to (typically) a sine wave at <1V.
(Where did you work for Siemens?)
** I have tried holding onto the (well insulated and screened) output cable of a VFD with one hand, and by putting a finger of another hand
near a button on a switch panel caused that button to activate without making any physical contact. We had to redesign that switch panel to make it less sensitive.