Probably just one primary tone per bollard, along with any harmonics. These will depend on the resonance frequency of the bollard.
Probably just one primary tone per bollard, along with any harmonics. These will depend on the resonance frequency of the bollard.
Probably just one primary tone per bollard, along with any harmonics. These will depend on the resonance frequency of the bollard.
Probably just one primary tone per bollard, along with any harmonics. These will depend on the resonance frequency of the bollard.
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Probably just one primary tone per bollard, along with any harmonics. These will depend on the resonance frequency of the bollard.