Feedback Control for the reduction of a stochastic broadband disturbance is widely used in experimtal investigations, where as feedforward control is often used in one-dimensional cases only. However, if the spatial and temporal correlations of the reference signals and the disturbance signals are high a feedforward controller is able to achieve a broadband disturbance reduction. In this research the placement of actuators and sensors is investigated to meet the special requirements of a feedforward control system (coherence, causality) to improve the sound transmission loss (＜500Hz). Furthermore a double panel partition is realized in a sound transmission loss facility to investigate feedback and feedforward control systems. The experimental results prove the ability of the feedforward controlled smart trim panel to considerably reduce radiated sound power in third octave bands.
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