When I researched the Kappa 8's I recall they really needed an amp that would power a 2 ohm load. Here is one of the threads I found with a guy that had his amps eaten.
https://forum.audiogon.com/discussions/infinity-kappa-8-s
I don't have personal experience with the Krell but that post might be a good starting point.
https://forum.audiogon.com/discussions/infinity-kappa-8-s
I don't have personal experience with the Krell but that post might be a good starting point.