Figure 3
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Power spectrum density plots of acoustic pressures measured at source-side (solid lines) and transmission-side microphones (dashed lines) of flexible-plate resonator with tplate = 2 mm for (a) the 45 m PU tube termination and (b) the closed-end termination on the transmission-side. At the resonance frequency of 37 Hz, the transmitted signal is close to the noise floor.
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