I would say some of the most under-rated are Pi Speakers, by Wayne Parham. In my opinion, the designs of his that I have spent some time with, the 4Pi and 7Pi, are superb.
Wayne offers plans for free, and his designs use prosound drivers which many audiophiles have prejudices against, but he uses really good-sounding, studio-quality ones. And he is a master of crossover design (he was one of my teachers).
Wayne also offers assembled speakers, but I get the impression that because they are also offered as a kit, they do not have the mystique that many audiophiles are attracted to.
Duke
Wayne offers plans for free, and his designs use prosound drivers which many audiophiles have prejudices against, but he uses really good-sounding, studio-quality ones. And he is a master of crossover design (he was one of my teachers).
Wayne also offers assembled speakers, but I get the impression that because they are also offered as a kit, they do not have the mystique that many audiophiles are attracted to.
Duke