MERIT B, LEMARQUAND G. Ironless Lowfrequency Loudspeaker Working Under its Resonance Frequency. Arch. Acoust. [Internet]. 2008 Jan. 31 [cited 2026 Apr. 18];33(4(S):59–64. Available from: http://acoustics.ippt.gov.pl/index.php/aa/article/view/836