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This paper presents the experimental results in the application of feedback control of acoustic noise in an cavity of timber with a flexible lid of an aluminium sheet. The cavity is considered as a sound-structure interaction system. The paper demonstrates a practical way to design a controller using minimax LQG methods. It is also shown that the proper choice of a weighting function is an important step in the controller design. The designed controller with low-order is not only robust to unmodeled dynamics and parametric uncertainties but also convenient to being output feedback with guaranteed stability. In addition, the interesting results can be further improved by proper selection of actuator and sensor placement.