Doppler vibrometers are remote sensing devices capable of estimating the frequency and amplitude of the vibration of a target, for example in remote detection of vital signs and acoustic signals. In the case of mechanical systems, can be particularly useful to know the frequency response of the system, for instance, to detect resonant frequencies. This paper presents a prototype of a 24 GHz Doppler vibrometer and validates a technique for estimating the frequency response of a loudspeaker, an exemplary electromechanical actuator. This paper describes and validates a reliable technique for frequency response analysis of electromechanical systems.