This is an interesting discussion. I have personally moved away from power hungry loudspeakers and boat anchor amplifiers to horns after 30 odd years in high end audio. The most power hungry amplifier I owned for a few years was the Krell 750 MCx, weighing about 180 pounds and needing 20 amp outlets. As it warmed up, it would make clanking sounds as the metal plates expanded from all the heat. I also owned a pair of Audio Research Ref 210s with 8 KT 120 tubes per channel — I think at idle it consumes about 500 watts! I view these as really wasteful designs now.
With my Klipsch La Scalas, I find I can use extreme low power amplifiers. My current reference is a pair of Triode Labs monoblock, which uses one 45 power tube to produce 2 watts per channel. These tube monoblocks run cooler than my Oppo Blu Ray player. Because the La Scalas are so efficient, I don’t need power hungry boat anchor amplifiers. The sound I now get is among the best I’ve ever heard after owning dozens of high end loudspeakers. After a lifetime in audio, it feels strange to move to horns, but I’m glad I did. It changes your whole perspective on audio. I don’t have any interest in other loudspeakers at this point (except perhaps the Klipschorn, if I can find a suitable location for them in my house as they do best in corners).
High efficiency low distortion horn loudspeakers driven by extreme low power tube amplification. That is my mantra now.