Analytical and experimental results from the implementation of a feedback, active structural acoustic control (ASAC) system are presented. The test bed is a rectangular, simply supported steel plate inserted in a semi-infinite baffle inside an anechoic chamber. Piezoceramic patches are wired as bending transducers and implemented as adaptive piezoelectric sensoriactuators or self-sensing actuators. The transfer function across a sensoriactuator is minimum-phase, thereby enhancing stability for feedback control applications. Radiation filters are implemented to design the performance cost used in the control synthesis. Several design parameters are examined for different square (equal number of inputs and outputs) control configurations. Both single- and multichannel control system implementations are considered. Sensor and actuator optimization is performed using nonlinear optimization techniques, and both dynamic and static compensation are compared.