Power or wpc do not translate into sound quality. The Class A mono block tube amps we build easily outperform many higher wpc amps on many different speakers at various ratings or recommendations by the manufacturer. We drove a pair of Vandersteen model Sevens 83.5db with a 28wpc stereo tube amp from ART Audio with no issues. So you need to experiment.
A little deeper on amp power please....
If somebody could elaborate on exactly how a higher watt amp will improve the sound of speakers (lower sensitivity speakers that “need” power). More specifically, I get that when the nature of the recording and the volume setting demand an immediate spike in power, an amp that delivers the spike will perform better than one that does not. But when I used to have an amp with output meters, it would be in single digits for most normal listening, and I don’t recall what a spike would have been - I want to say 15 or 20 watts. What I am scratching at is whether there is something more to power, i.e. the notion that the effortless power of, say, a 300 watt amp would somehow be an improvement over an otherwise similar 75 watt amp…even if a spike is just 20 watts. Hope the question make sense.