In this paper, a new active noise control system is proposed using an adaptive prediction algorithm. The adaptive prediction-type active noise control system has many attractive advantages; for example, no prior knowledge of primary noise fields will be needed. However, difficulty in the control of broadband noise was encountered. For example, a new system configuration with an auxiliary sensing microphone is proposed. The computer simulation revealed that an auxiliary sensing microphone can improve the noise reduction remarkably in a wide frequency range if the effective sensing of primary noise is not expected by a single microphone. It is also demonstrated that the improvement of noise reduction is considerable depending on the arrangement of sensing microphones.