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... high efficiency/sensitivity, it also has an EPDR that goes down to about 2 ohms at several points.
A 300B type amp is not the best choice to drive such a load.
A better choice - and one that is far less expensive, yet could also be considered as an "heirloom" piece - is the Audio Research I/50.
The I/50 can maintain its power output into an impedance as low as 1 ohm.
https://www.hifinews.com/content/klipsch-la-scala-al5-loudspeaker
https://www.hifinews.com/content/audio-research-i50-integrated-amplifier