Traditional location methods based on microphone arrays have certain limitations in locating wide-area low-frequency acoustic signals at kilometer-scale distances. To improve location accuracy , field experiments were conducted using a 32-element acoustic array to investigate the locating performance of the time delay minimum variance (TDMV) method and the beamforming (BF) method in a 5 km outdoor environment, focusing on low-frequency sound signals from the same source. Experimental results indicate that compared to the traditional BF method, the TDMV method exhibits a significant advantage in location accuracy over wide-area ranges, achieving an improvement of more than 2.1% in precision. These findings extend the effective range of sound source location and provide a feasible solution for the accurate location of low-frequency sound sources.