I too agree with most that have been said here about the two speakers. They both are rather different in character, the Proacs being more accurate and truthful to the recording and the Sonus Fabers being more warm, colored and lush-sounding. It really depends on musical taste and preferences as there are fans for both these speakers.
I personally prefer speakers that are more neutral like the Proacs. The build quality on the Sonus Fabers are better though, exquisite Italian craftmanship especially on the higher models. The cabinets of the Proacs are typical British. My descriptions are based upon my previous experience with the SF Grand Pianos that I owned for nearly 3 years. A few other Sonus Fabers I've listened elsewhere are the Extrema and Electa Amator. I've listened to the Proac floorstanders at a local dealer but forgotten the model.
I personally prefer speakers that are more neutral like the Proacs. The build quality on the Sonus Fabers are better though, exquisite Italian craftmanship especially on the higher models. The cabinets of the Proacs are typical British. My descriptions are based upon my previous experience with the SF Grand Pianos that I owned for nearly 3 years. A few other Sonus Fabers I've listened elsewhere are the Extrema and Electa Amator. I've listened to the Proac floorstanders at a local dealer but forgotten the model.