Music spatialisation is one of the means to enrich the performance effect, and the use of digital technology to construct a virtual music space greatly improves the accessibility and availability of the orchestra’s performance. This paper explores the path of virtual music space construction and enhances experience, and proposes a sound field replay technique. A ball microphone array is used to measure the raw ATF, and a sparse decomposition algorithm is used to reduce the number of measurement microphones. The target sound field can be reproduced accurately by solving the loudspeaker excitation signal. Experimental analysis reveals that in the [250,550] Hz interval, the method in this paper has obvious advantages compared with the traditional method, and the mean scores of listeners’ subjective evaluations of physiological immersion, psychological immersion, and emotional immersion are all greater than 4, which indicates that the constructed virtual music space has a better immersive experience, which is conducive to achieving a better performance of small chamber orchestra.