UcD: feedback signal

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in the original UcD, the feedback is a voltage signal post the filter. Is it possible to feedback something else? for example, what about the current going throught the inductor? or the capacitor? or the speaker/loan? it can be done via a small sensing resistor, or a little coil around the inductor.

feeding back a current has the added advantage of acting as an overcurrent protection. but I don't know if it would have any practical implication on sound quality.

has anyone done that?
 

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