%0 Journal Article %T Investigation of the dynamic efficiency of complex passive low %A A Kilikevicius %A G Viselga %A M Jurevicius %A V Turla %A V Vekteris %J Journal of Low Frequency Noise, Vibration and Active Control %@ 2048-4046 %D 2019 %R 10.1177/1461348418822230 %X In this study, the theoretical and experimental investigations of the dynamics of complex passive low-frequency vibration systems are described. It is shown that a complex system consisting of a vibrating platform, an optical table and a vibration isolation system of quasi-zero stiffness loaded by a certain mass may isolate low-frequency vibrations in a narrow frequency range only. In another case, the system does not isolate vibrations; it even operates as an amplifier. The frequencies that ensure the top efficiency of the vibration damping system of quasi-zero stiffness were established %K Vibration isolation %K vibration damping systems %K quasi-zero stiffness %U https://journals.sagepub.com/doi/full/10.1177/1461348418822230