PC speaker

I've been reading about outputting PCM audio through the internal PC speaker using "Pulse-width modulation". If I understand correctly, this is acheived by retracting the speaker cone before it has a chance to fully extend. My question is now this: would it be possible, by spending all CPU resources on this task, to keep the speaker cone in its current mid-extension position, by rapidly (as fast as the CPU will allow) toggling the current to it?

>>20
Not sure if trolling...
I believe this is fundamentally broken. The physical details of the speaker are exactly why the PWM trick works at all. That is why the type of speaker makes a difference.
Nor does human hearing work by "averaging" power levels over a window - the ear hears frequencies. You need to produce a convincing frequency spectrum, you can't fool it by just flickering fast enough.
By your way of thinking there would be no problem dimming a fluorescent lamp - just deliver some power and it will have to do `something' with it.