Study of the Active Acoustic Absorber Based on a Shunted Loudspeaker Natalya Khudiakova, Aleksei Bykov, Alexandr Komkin and Stanislav Sementsov MATEC Web Conf., 320 (2020) 00019 Published online: 24 September 2020 DOI: 10.1051/matecconf/202032000019