When they were developing the Forte’s they were considering calling them Kg5s. They are a fusion of the Klipsch Heresy speaker with a larger version of the passive radiator from the Kg4s. The Heresy was originally developed as a center channel speaker to go with Klipsch larger speakers. They were very efficient and detailed but lacked much in the bottom end. Fortes are still incredibly efficient offer a nice midrange but have a much lower and smoother bottom end. I would love to use the excuse that my wife wouldn’t let me have them due to size (true but irrelevant) but the real reason is that they were simply to rich for my budget at the time. They still sell a series IV of the Fortes but they are now over $4500 a pair. I’m not familiar with the Sonus Faber speakers I’ll have to check and see if our local audio stores sell them just to hear them. Enjoy.