This paper presents a multiple-input/output inverse theorem (MINT) with an application to active noise control of feedforward architecture in ducts. In traditional approaches, adaptive algorithm, for instance, filtered-x least-mean-square (FXLMS), is broadly used to deal with this task. In order to ensure whether it works in practice, we compare MINT with FXLMS algorithm in simulation, and consequently we can observe that MINT approach has a better noise reduction performance than FXLMS algorithm does.