Unnamed feedback method explored.

[jacco vermeulen]

Originally posted by Mr Evil
Indeed. Maybe if someone were to work out exactly what it is that was removed, then a circuit could be designed to deliberately add it back in, but to an adjustable degree. Then maybe any amp could be improved.

Circuits that put extra harmonics into an amplifier already have been designed.
If the lack in sound is caused by your (maybe) harmonic differential amplifier it reads like a feedback feedback amplifier.

Using an offset opamp to feedback dc tosses out the dc part on the output.
Suppose your differential signal feeds back higher harmonics to the negative input of X1?