I owned those, just about anything will drive them, just need something with laid back highs, old school tubes come to mind.
As the upper mids and tweeter can take your head of with a bright amp that has a lean/tight bass as well.
The Pass Pass Labs XA-25 could be OK not too open in the highs.
Used Quicksilver amps would be nice
https://www.usaudiomart.com/details/649634350-quick-silver-kt88-tube-mono-amplifiers/
https://www.audiogon.com/listings/tube-quicksilver-silver-70-s-mint-condition-2013-02-20-amplifiers-08721
All will love passive preamps, even the Pass at 50kohms, unless your source has a volume control, then use it.
Cheers George