FrivolsListener
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OK,I'll play. In the interest of full disclosure I'm an electrical engineer and I've designed loudspeaker passive crossovers (professionally in a former life) for more than 40 years:
1) Even simple loudspeaker models account for all physical behavior that matters. It's electricity and acoustics and physics, it's not magic.
Yes. But speakers do things their designers don't want, like resonate. Making the perfect speaker is like trying to find the perfect unicorn.
2) No audio amplifier should EVER go into oscillation, unless it is defective or there is an error in the design. This has absolutely noting to do with the loudspeaker load. Unless something has broken or you have designed an oscillator, an audio amp will never oscillate. Now if you are talking about parasitic oscillation because of a high capacitance output in an amplifier, then what will happen is distortion and excess heat. But again, a properly designed amplifier should never do this. And at 40KHz you will never hear it.
Yes, parasitic oscillation, a problem with amplifiers. Jason mentioned briefly a problem with one of the Vidar prototypes. Perfect amplifiers don't exist, and they don't exist in a vacuum. A good amplifier design can be wrecked with a underpowered power supply.
Anyway, I'm not doing this to get into a war of, er, genital waving, but rather to say that not everything plays nice together, and sometimes you have to design to take into account an unpleasant load.