A list of efficient speakers at ~$5K a pair.

@elliottbnewcombjr yeah that is the opposite direction, the Sanders 10E site shows they like to pair them up with a powerhouse 500w-900w Magtec Class AB amplifier.

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Other:

My local dealer has Soundlabspeakers, and I’ve heard the Majestic 545px 8ohm speakers driven with my same Quicksilver 60-100wpc tube amps and they sound glorious too. Lower efficiency and 8ohms, yet the tube amps do okay with them fwiw. https://www.soundlabspeakers.com/majestic/

Actually he’s had the super large 945 units there and drove them with my same QS Mono 120 tube amps without issue, with the higher 8ohm impedance. I like the size of the shorter 545s with wider front size.

Would the OP go for these, who knows ;). Neither of these are "efficient" though, not even close. Not efficient. Tube amp capable, maybe

Arendal 1723's are 92 db and sound great.  Certified THX Ultra.  HDF cabinet.

The Fritz Carbon 7s is hard to beat with your requirements. A step up would be the Joseph Audio Pulsar Graphene but at a cost. Please take a look at these other options with benign load requirements, in that price range:

https://nsmt-loudspeakers.com/Performance-Series

https://shinjitsuaudio.com/

https://www.pispeakers.com/contents.html

Dieter

KEF Reference Ones are are 91 db I believe. And depending on your taste and space the Klispch Heritage line are very efficient and most are in your price range.

All the best.

curious jim ref ones are 85db sensitive

i would look at

Legacy Calbres: 90 db efficient, easy to drive, great bass, fantastic clarity with state of the art drivers

a large step up from the Scan-speak drivers in the Fritz.

Dave and Troy

Audio Intellect NJ

Legacy dealers