Haibei Tiandi Children's Park in Vientiane City, Siming District, Xiamen adopts the sound reinforcement system of Beilarly professional audio system, and the sound field characteristics of Beilarly's engineer Root Playground adopt PS-15 entertainment fixed installation series as the main sound reinforcement and S-218 + Ultra-bass speakers make the sound field of the whole playground not only evenly covered, but also the sound quality is clear, round and full, ensuring that every corner of the playground can be heard.