1 Pair) Zu Presence loudspeakers with internal class D subwoofer amps - matte Phoenix Red finish made in 2008
You can use a 50-150 watt amp, but it's not necessary to get the most musical sound out of them. They sound best with tubes, are a bit too "neutral" with solid-state. Hybrid amps sound a bit better than SS with these speakers. Overall, they are a neutral, accurate sounding loudspeaker, not warm and fuzzy. I would agree on most points mentioned in the 6moons review.
Retail price in 2008 was around $8-$10,000 a pair
Speaker details and review in these 2 articles:
6moons
https://tubeworldexpress.shop/audioreviews/zu17/presence.html
Daily Audiophile
https://tubeworldexpress.shop/zu-audio-presence-review-pfo/