ANALISIS KINERJA AKUSTIK PADA RUANG AUDITORIUM MULTIFUNGSI Studi kasus: Auditorium Universitas Kristen Petra, Surabaya - C. Indrani, Hedy; Jurusan Desain Interior, Fakultas Seni dan Desain, Universitas Kristen Petra, Surabaya (Institute of Research and Community Outreach - Petra Christian University, 2009)