Well, this (low-pass) model works quite well in the limit of low
volumes, when the pulse width is much less than L/R time constant
of spkr. But it is dangerous to push this explanation very far
beyond that.
I actually spent a lot of time a few years back trying to improve
on the pcspeaker performance based on this model, and was eventually
forced to admit that it either does not tell whole story or simply
has poor predictive powers.
Was only after taking another look this weekend with benefit of
hindsight that I find a trivial calculation which explains
why. This is why I was quick to post: it would be a shame for
anyone else to waste similar time chasing down a blind alley.
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