Doubling the number of pistons by introducing the phase shift of the port plates has positive effects on lowering the noise levels. Reducing pressure pulsations directly affects the sound output. Pressure pulsations generated by the pump in the system will be reduced as well. This results in a reduction of fluid borne noise.
Also the sources of mechanical sound are strongly reduced. Most important in this aspect is the almost complete balancing of hydraulic forces. The forces on the bearings decrease, reducing the transfer of pulses and vibrations to the housing. This results in lower noise levels.