A sound suppression structure is made up of plural planar vibrational units, which establish plural resonant frequencies. A dissipative layer is positioned on a front side of the vibrational units with a separation between the dissipative layer and the planar vibrational units sufficient to permit substantially free movement of the planar vibrational units. A shallow sealed gas cell array is positioned behind vibrational units, with one or more of the planar vibration units forming one side of each sealed gas cell in the array. The sealed gas cell array interacts with the planar vibrational units to absorb energy at the resonant frequencies. The dissipative layer enhances absorption efficiency, resulting in absorption of energy at frequencies other than the resonant frequencies, and the combination of the planar vibrational unit, the shallow sealed gas cells and the dissipative layer providing a plurality of resonant modes for broadband sound absorption.
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