The conference consists of sessions so far organized as part of separate conferences: Open Seminar on Acoustics (OSA) and Symposium on Hydroacoustics (SHA). OSA is the largest meeting in Poland of acoustics and scientists associated with the broadly understood acoustics. On the other hand, SHA is the only conference in the country where scientists from acoustics and hydro-acoustic systems meet. Both conferences have a long tradition in the Polish scientific community. An additional event that usually accompanied the OSA conference will be Polish-German structural sessions, organized in cooperation with the Deutsche Gesellschaft fur Akustik (DEGA) association. The conference topics include: biomedical acoustics, building acoustics, interior acoustics, acoustics, hearing proto, musical acoustics, psychoacoustics, environmental acoustics, technical acoustics, material testing, electroacoustics, hydroacoustics, ultrasounds, noise control, vibroacoustics and other similar issues.