The coupling effects of a commercial dc superconducting quantum interference device (SQUID) to an electricalLCresonator which operates at audio frequencies(≈1 kHz)with quality factorsQ≈106are presented. The variations of the resonance frequency of the resonator as functions of the flux applied to the SQUID are due to the SQUID dynamic inductance in good agreement with the predictions of a model. The variations of the quality factor point to a feedback mechanism between the output of the SQUID and the input circuit. ©1997 American Institute of Physics.