Max,
it is a misconception to believe that the anti-vibration systems in use will have any effect on the vibration levels experienced by MGB componants. The S-92 uses a system of 'Force Generators' - either 3 or 6 depending on customer option - which are strategically placed to counter the vibrations experienced within the fuselage. Bear in mind that the fuselage has nodes and anti-nodes and there is not one constant level of vibration experienced throughout. The force generators systems (Active Vibration Control) are tuned to the individual signatures of the aircraft they are installed in.
Other aircraft use diffenet systems (if at all) and the EH-101 uses hydraulic struts between the MGB and the fuselage, thereby stopping the vibration transfer in the first place.