It is a Volti. I don’t think it needs anything special as it is high sensitivity. any competently made amp should do
Well that’s one of the most ignorant things I’ve seen written here, and that’s saying something. Anyway, you seem to be looking for the expressive mids of tubes but without rolled-off highs and with good bass control — sound about right? I’d take a look at this Valvet E3 Class A amp that may sound sublime with your speakers. Read the stellar reviews.
https://www.usaudiomart.com/details/650175757-valvet-e3-amplifier/
Here’s a LTA amp that’s also worth considering given what you’re looking for. It’s got tubes, but in this ZOTL design they last a lot longer than with other tube designs so may still be worth considering.
https://www.usaudiomart.com/details/650280212-linear-tube-audio-lta-zotl40-reference-amplifier/
Just a couple ideas FWIW, and best of luck.

