Personnal since you are running Kappas and my experience with Kappa 7's I once owned is that they were hard to drive. I found that by adding a McIntosh MC352 with autoformers that the speakers really came to life in all the suffering areas I had been experiencing with previous amps. I see a MC352 listed at recycled_audio here on AudioGon right now that may be the ticket. This is just my experience and I am sure you will get many suggestions, but I really felt the Autoformers acted as a buffer between the amplifier stage and speakers.
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