The school I am documenting has a Music Classroom that is mostly composed of ACT which meets the required NRC of .7, however, some of the ACT tiles have been replaced by Pyramid Sound Diffusers with only an NRC of 0.1. Is there something I am missing here? It doesn't seem right that we would not comply with the Prerequisite or achieve LEED for that matter, because of something that is commonly done is music rooms. Would the Music room not be considered a core learning space? Any advice would be appreciated.