This is a pre-copyedited, author-produced version of an article accepted for publication in Acta Acustica united with Acustica following peer review. The version of record is available http://www.ingentaconnect.com/content/dav/aaua/2018/00000104/00000002/art00004;jsessionid=3frf0btb6fth9.x-ic-live-01