Abstract An Auckland chamber choir and orchestra, which performs regularly in a city church, has long had difficulties in balance between choir and orchestra. A set of reflector panels was designed to improve this balance and constructed as a student project in the department of Architecutre. Subjectively it proved very successful. Differential C 80 measurements between choir and orchestral positions are proposed as a way of quantifying this improvement and results of a set of exploratory measurements are reported. As a post-script a comment on the liturgical/political dimension is included.