>
> > > > 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!)

Seriously, the current transformer sounds like the most practical approach.
Alternatively, you could do a couple turns around a ferrite disc, and make
that hall sensor much more sensitive, and maybe less costly too.


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