the 4.7R case is of course not supporting my hypothesis as you say.
The 1% THD case has the amp in clipping for part of the time and here the feedback loop is powerless. this may raise the noise floor but that’s still much much below the distortion from clipping. Bruno’s loop design secures very clean and fast recovery from clipping both from voltage and current limit. This is an area that could be good to include in amp reviews.
Note that I work primarily on our transducers and not directly with the amps (I leave that to Bruno and Søren who are much better than me). As I understand, The faulty pilot batch had a misplaced protection diode that was causing trouble for one of the op amps. unfortunately not caught soon enough since it only showed up close to clipping and at high frequencies. A very frustrating mistake indeed.
The 1% THD case has the amp in clipping for part of the time and here the feedback loop is powerless. this may raise the noise floor but that’s still much much below the distortion from clipping. Bruno’s loop design secures very clean and fast recovery from clipping both from voltage and current limit. This is an area that could be good to include in amp reviews.
Note that I work primarily on our transducers and not directly with the amps (I leave that to Bruno and Søren who are much better than me). As I understand, The faulty pilot batch had a misplaced protection diode that was causing trouble for one of the op amps. unfortunately not caught soon enough since it only showed up close to clipping and at high frequencies. A very frustrating mistake indeed.