The Scientific and Organizing Committees of 59th Open Seminar on Acoustics would like to present the abstracts of papers submitted for this conference. The Open Seminar on Acoustics (OSA) is an annual conference, the largest in the country which has been bringing Polish acousticians together for nearly sixty years. It is organized sequentially by different departments of Polish Acoustical Society (PTA) – in 2012 by the Poznań Division. The conference presents all sections of acoustics, such as: physical acoustics, technical acoustics, environmental acoustics, speech acoustics, hearing acoustics, musical acoustics, architectural acoustics, etc. The aim of the conference is to exchange scientific experience in the field of acoustics, promote science and integrate specialists from various fields.