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Due to the demand for higher accuracy and lower acoustic noise levels, there is a growing interest for active vibration suppression in industrial application. Many control concepts have been proposed in this field that are suited to introduce damping in systems with a large number of modes. However, tuning is often focussed on reduction of one dominant mode. Such control approaches are less transparent when several dominant modes are involved. A combined loop-shaping and root-locus tuning approach is proposed to reduce several dominant modes with low-order controllers. The tuning approach is experimentally evaluated on a vibrating plate using piezo's for both sensing and actuating. Based on the given tuning rules and tradeoffs, a single-input-single-output (SISO) feed-back controller is designed and implemented. This low authority control approach shows that besides local performance, the global damping of the plate is also improved, which consequently results in reduction of vibration levels over the whole plate for a broad range of frequencies. As a results, acoustic noise radiation is reduced significantly.