The Helmholtz resonator principle can be used by adding a volume in a side branch. The fluid in the volume and its connecting line form a resonant subsystem. Only pulsation waves at frequencies below the particular resonant frequency of the resonator can be attenuated by this arrangement. No useful attenuation effect is gained at higher frequencies [1].

[1] Akers, A., Gassman, M., and Smith, R., 2006, "Hydraulic Power System Analysis", CRC Press - Taylor & Francis Group, ISBN: 0-8247-9956-9, pp. 354