The acoustics in Philadelphia’s Kimmel Center, home of the Philadelphia Orchestra, have been criticized ever since the center opened in 2002. The main concert hall was designed to be as acoustically adjustable as possible, but the orchestra still hasn’t managed to find the right combination to create a full, warm sound throughout the hall. Still, Philly Pops, a separate orchestra from the Philadelphia, has been tinkering as well, and they may have uncovered some important methods for improving the Kimmel acoustic.