The ability of electrochemical interfaces to exhibit electric resonance and antiresonance is studied experimentally. The system under investigation is the electrodissolution of iron in sulfuric acid. The impedance of the system in the vicinity of a Hopf bifurcation is studied while the system rests on a steady state of a stable focus type. The frequency response is explored for different values of the solution concentration as well as different external ohmic resistance values. It is shown that the system undergoes electrical resonance and antiresonance at frequency values determined by the system parameters and thus acts as a resonator (band-pass filter) or wave trap (band-stop filter). (C) 2012 Elsevier Ltd. All rights reserved.