The sound system of the multi-purpose lecture hall of Zhejiang Unicom Company adopts the fixed installation series of Beilarly professional audio. Engineers have developed a complete sound system solution based on the size and function requirements of the report hall. The sound field of the entire meeting room is not only evenly covered, but also the sound quality is clear, high fidelity, and there is no harsh noise, making the intermediate frequency round and full. The high frequency is delicate, and the low frequency dive is full of flexibility, ensuring that the sound of each corner of the hall is thick and the tone is bright and prominent, which has won the unanimous praise of the majority of consumers.