I just sold an old beast that would do the trick... PS Audio 200C.... Its very temperamental, but once you have it set up, It is a fine sounding piece of gear at any price and today they go from $400 to about $800 depending on condition, age, repairs done etc. 200 to 8 ohms, 400 to 4, 800 to 2 ohms and 1000 to 1.5 ohms.... Doubling down all the way to 1.5 ohms, this should handle your Kappa 9's without issue. I did an internet search, the only one that I see listed anywhere right now is $719.
There are other amps that will work, but this came to mind, good luck in your search, Tim
There are other amps that will work, but this came to mind, good luck in your search, Tim