I have a 300b Amp driving my Forte and it is a great sounding combo but it will run out of steam if you push it....which I don't. The sweet spot for those amps are a few watts, not their full rated power.
Those same speakers will play considerably louder with my Quicksilver. Amps that are 40 watts but they lack that beautiful tone that my WE 300bs have.
I have a pair of Sonus Faber in my bedroom powered by a 40 watt Cyrus Integrated Amp. That Amp drives the SF easily but being 85 dB sensitive they aren't the best match. Again, they sound great until you push them. Those are being replaced in a few days with Omega speakers that have a sens of 94.5 dB / w and should be a better match.
I like low power amps but it limits your choice of speakers. A lot. I could see where Forte and a 300b amp would not be a good match, it's not a lot of power and could be a problem with large rooms especially if the owner likes to crank it up. Those amp's "forte" is awesome tone, not high volume levels.