The Proac 4 speakers used 2 ATC 3 inch dome midranges. The Proac 5 speakers used 2 7 inch Scanspeak midbases.
The best midbase I ever heard, is the JM Lab midbase on the Mezzo utopias and the Utopia speakers. The other midbase that sounded incredible, was the midbase on the Sonus Faber Extremas. Holy Moley did this midrange sound incredible. It was a custom made Skanning midbase. It was a Carbon Fiber Polypropelene midbase.
The best midbase I ever heard, is the JM Lab midbase on the Mezzo utopias and the Utopia speakers. The other midbase that sounded incredible, was the midbase on the Sonus Faber Extremas. Holy Moley did this midrange sound incredible. It was a custom made Skanning midbase. It was a Carbon Fiber Polypropelene midbase.