Chaotic State in an Electrodynamic Loudspeaker
An electrodynamic loudspeaker has been driven in comparatively strong nonlinear conditions. For driving AC currents up to 1 A the vibration spectrum contains high frequency harmonics of classic von Kármán type, for currents in the range 3.4 to 3.6 A doubling of driving period appears, for currents in the range from 3.6 to 4 A multiple sequences of subharmonic vibrations appear beginning with 1/4f and 3/4f, while an application of currents larger than 4 A results in white noise spectrum, characteristic for chaotic state.
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