present invention the hydraulic mount assembly incorporates a magnetically responsive decoupler 32 that acts in cooperation with a variable magnetic force supplied by coil 70 the variable magnetic force is applied to either restrain the decoupler 32 from being pushed toward a seated position by fluid forces or to force the decoupler 32 into a seated position completely restricting bypass fluid flow around the decoupler when the decoupler is firmly seated by a maximum magnetic force fluid flow between the primary chamber 46 and the secondary chamber 48 is limited to that through the orifice track 54 providing a maximum stiffness for the mount specifically by modulating the voltage supplied to the coil 70 the damping characteristic of the assembly is actively tuned so as to best dampen troublesome vibrations occurring during any particular operating conditions the transducers 90 may be provided to instantaneously sense the amplitude and frequency of vibrations being produced at any given time the preprogrammed microprocessor 84 is provided to instantaneously process the information from the transducers 90 the microprocessor 84 in turn operates a variable voltage source 80 to modulate the magnetic force produced by coil 70 automatically yielding the most effective and efficient damping and vibration isolation the foregoing description of a preferred embodiment of the invention has been presented for purposes of illustration and description it is not intended to be exhaustive or to limit the invention to the precise form disclosed obvious modifications or variations are possible in light of the above teachings the embodiment was chosen and described to provide the best illustration of the principles of the invention and its practical application to thereby enable one of ordinary skill in the art to utilize the invention in various embodiments and with various modifications as are suited to the particular use.