In an enclosed space, the multi-channel ANC system can better achieve overall area noise reduction compared to a single-channel active noise control (ANC) system. In this paper, single-channel and double-channel experiments are carried out for the designed three-dimensional space, and the secondary sources and error sensors are arranged based on the experimental method. The experimental results show that for low-frequency narrowband noise, the multi-channel system has a significant noise reduction effect. After the algorithm is turned on, the noise reduction of 11.4dB is achieved in the designed device space, and the noise sound pressure level is evenly distributed than that of the single-channel system.