CPC H04R 1/2873 (2013.01) | 20 Claims |
1. An audio apparatus comprising:
a housing forming an acoustically closed interior space;
a speaker coupled to the housing and configured to emit sound; and
a low-frequency filter disposed within the interior space and configured to filter a plurality of frequency bands within a stiffness-controlled response domain of the audio apparatus, the low-frequency filter comprising a plurality of acoustic pathways, wherein:
each of the plurality of acoustic pathways comprises a first end that is open to the interior space and a second end that is closed; and
each of the plurality of acoustic pathways has a different length corresponding to a different frequency band of the plurality of frequency bands within the stiffness-controlled response domain of the audio apparatus.
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