"With CAL, we have excellent coverage of the entire hall with installation at one point," says Ingeborg Doblander, head of technical production for the Konzerthaus. "By placing both CALs behind the golden leaf grilles at the center of the venue, we solved the time alignment problems that were present in the old system. This resulted in in very good STIPA [Speech Transmission Index for Public Address] measurements."
The CAL systems were chosen following a rigorous evaluation process consisting of measurement and listening tests. "Several systems were brought in at different times, and no participants were given information about the others," reports Doblander. "We collected the data for each demonstration, and that served as the basis of our final decision in favor of CAL."
In the 1,840-seat Great Hall (German: Gro
