Clive
Experienced
This is a common misconception. The Kemper does not use "3-dimensional" IRs (whatever that is). The file size if far too small to support that. It uses standard IRs and quite short ones at that. IIRC they are only 256 samples. The Kemper has seven (last I checked) base amp models. It finds the model that is closest to the measured response. It then does an EQ and gain match for that model. It also finds the input EQ. The heart of the Kemper is gain and EQ matching. You'd be surprised how far that goes in recreating an amp.
This is the kind of "revelations" I love but are they real revelations ? I've already heard about this theory of base amp models in the KPA : it explains why some people often feel the same when playing with their KPA but I've heard it was more than seven base amp models.
Does the Axe FX II loaded with G3 rely on certain base amp models too ?
About this theory of gain matching, this very interesting, can you tell us more about this please ?