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What is the cut-off frequency of opening apertures with finite depth into a plenum?

Cutoff frequency

Sound transmission class

Transmission loss

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The cutoff frequency of opening apertures with finite depth into a plenum can be predicted using the modal and sound transmission coefficient superposition (MSTCS) method . This method is applicable for apertures of arbitrary cross-section and can be used both below and above the cutoff frequency. The MSTCS method has been compared to other methods such as the transfer matrix method, acoustic FEM, and experimental data, and has shown good agreement .

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Open access Determining the transmission loss of apertures above the plane wave cutoff frequency Jian Chen, Can Li - Show less +1 more 01 Jan 2014	The provided paper does not mention the cut-off frequency of opening apertures with finite depth into a plenum.
Journal Article•DOI Arbitrarily high focal depth with finite apertures. Jorge Ojeda-Castaneda, L. R. Berriel Valdos - Show less +1 more 01 Mar 1988-Optics Letters 72 Citations	The provided paper does not mention the cut-off frequency of opening apertures with finite depth into a plenum.
Proceedings Article•DOI The finite amplitude depth sounder (FADS) G. Walsh 01 Jan 1971 1 Citations	The provided paper does not mention the cut-off frequency of opening apertures with finite depth into a plenum.
Journal Article•DOI Measurement of the Transmission Loss of a Finite‐Depth Aperture George P. Wilson 01 Feb 1965-Journal of the Acoustical Society of America 5 Citations	The provided paper does not mention the cut-off frequency of opening apertures with finite depth into a plenum.

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