> >
> > > > > I have an application where I need to monitor and
> > > > > digitize the current waveform output of an audio power
> > > > > amplifier into a subwoofer (speaker).
>
>
> Cheat :)
> Drive the speaker with a voltage to current converter.
> I built a stereo amp some years back, using the LM-12 in this
> configuration.
> It always mystified me why we drive a device that converts
> current into
> sound pressure, with a voltage waveform.
> The current amp applies a very interesting waveform to the
> load, but the
> sound is at least the same, and probably somewhat better,
> though my ears
> are too old to hear it. (Youth IS wasted on the young!)
>
About 1980 I worked with some HiFi audio professors at college.  I asked
about current drive of speakers and was told that it had been tried,
they had also tried using displacement feedback from the speaker cone.
But neither of those techniques produced the right "sound".  There are a
lot of (seemingly) irrational things that go into high end audio, and I
put it down as another of them ;-)

I work in sonar now.

Sherpa Doug

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