Another recommendation to look into Audio Note. I have an old pair of AN-E/Ls (92 dB efficiency). I am driving them with a 2A3 SET amp, 3.5 watts, and they will play way louder than I can tolerate, without distortion, in my modest 11.5” x 11” room.
The only way to know for sure is to try them, but it’s hard to imagine your amp won't be very happy driving ANs. They are just wonderful, musically engaging speakers, IME.
The only way to know for sure is to try them, but it’s hard to imagine your amp won't be very happy driving ANs. They are just wonderful, musically engaging speakers, IME.