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Hydraulic engine mounts are used in the automotive industry because they offer frequency and amplitude response characteristics superior to the conventional elastomeric engine mount. This response is well established but is not fully understood. Numerous articles have attempted to explain the complex behavior of these mounts using linear theory. This paper uses the same linear models developed in previous papers, but offers a more fundamental explanation of the system response using these previously derived two degree of freedom models. In addition, the source of engine vibrations and their corresponding frequency ranges are explained in detail. Techniques borrowed from control systems are used to interpret system response and terminology used in the automotive industry to describe the behavior of hydraulic engine mounts is clarified. Validation of the two degree of freedom model is made by comparison with experimental data.