After four years of renovation, Paris’ Salle Pleyel reopens this week. The theatre is the Carnegie Hall of Paris. “The acoustics used to be a weakness of the Salle Pleyel. To improve them, architect Francois Ceria and Artec Consultants Inc., the acclaimed New York sound gurus, have encircled the platform with a wooden wall and added four narrow side balconies and a number of rows behind the orchestra, replacing the old Cavaille-Coll organ with a human reflector.”