Take a ride down to Santa Fe. There is a local speaker builder here. Viking Acoustics. David makes high efficiency speakers. My Tube Master's are 98db. They work great with my Allnic 300b amps. I've also had a pair of his Berlin's. Check out his website. You are also welcome to listen to my Tube Master's. I live in Santa Fe as well.
Devore or Audio Note or other sensitive speakers: wanting to listen in Denver
I'm on the hunt for a sensitive speakers to play really nicely with my Quicksilver Mono 60 amps. I've heard some nice Spatial X3's here in Denver thanks to a local audiophile. I was especially taken by their AMT tweeters.
If you're in the Denver area and have Devore, Audio Note, Zu, Tekton, or any other speaker which has really worked well for your tube amps, please DM me. I would be deeply grateful for even an hour of listening time. Thank you!