This paper considers the feedback control ofsound radiation from a panel. Modelling is first used to designthe sensors and actuators which are most effective in terms ofboth their acoustic and control performance. Controlling thevolume velocity of a panel to reduce its sound radiation haspreviously been shown to be an effective strategy when thedisturbance is tonal and, in this paper, the technique isextended to broadband disturbances. The use of variousstructural actuators and sensors is compared for theirperformance and practicality in active structural acousticcontrol (ASAC) applications. The best combination oftransducers is then used to design an experimental rig. Measuredfrequency response functions are found to compare well withthose obtained in simulations. Feedback control of the volumevelocity of the panel is then investigated. It is shown that, toincrease the performance of a feedback control system, the plantfrequency response should be as close to minimum phase aspossible, which can be achieved by changing the positions ofsecondary actuators on the plate. Internal model control (IMC)is then reviewed and an IMC feedback controller implemented inreal time on the plate. The attenuation obtained is comparedwith the attenuation obtained from simulations. Limitations inthe current experimental system are also discussed.