With the success of feedforward techniques for active noisecontrol, feedback control researchers have begun to explore therelationship between these two control paradigms. The goal of thepresent paper is to further investigate this relationship by means ofthe classical Bode integral constraint on achievable performance. Theseresults provide insight into the phenomenon of spillover which has beenwidely discussed in the vibration control literature. Specifically, itis shown that a particular feedforward controller called the zerospillover controller avoids spillover by producing perfect disturbancecancellation at every frequency. For realizability, we derive theapproximate zero spillover controller which is shown to be an optimalfeedback controller for an LQG problem with suitable cross weights.Finally, the results are illustrated by means of illustrative mechanicaland acoustic examples
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