Sonus faber The Zero Vibration Transmission Technology was developed to avoid the transmission to the floor of vibrations (the ones having frequencies below 80 Hz) caused by the driver’s mechanical excursion. “The purpose is avoiding the introduction of “acoustic dirtiness” into the listening environment which negatively impacts the quality of music reproduction. Springs or elastomers are placed on the loudspeaker base. The decoupler’s compliance is calculated based on the weight of the speaker.”