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Stan White designed an amplifier with power rather than voltage
feedback, called "Powrtron", sometime in the 1950s. It appears in the
"Audio Anthology" books chronicling audio development and reprinted by
OCSL/The Audio Amateur. Mr White seems to be still going at it, to
judge from a website.

But is power feedback compatible with crossover networks in modern
speakers? Power feedback seems similar to the variable damping feature
which was offered in the late 1950s as an option on several
amplifiers.

That feature seems to have died out. Apparently variable damping made
a mess out of the earliest speakers designed using Thiele-Small
parameters, which assume a perfect voltage source.

Has anyone any differing or additional commentary? It seems like an
interesting detour interms of technical history.

[BretLudwig]

White is a well known crank and nut with some fringe science views.
Another such nut is, or was, Bruce De Palma. No idea if he was related to
the director.

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[megadream20]

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[Eeyore]

wrote:

Stan White designed an amplifier with power rather than voltage
feedback,

Sounds unlikely and can't see the point anyway.

Graham