On the third floor of Heping World, Chongqing Road, there is a professional audio market in Changchun. There is a company called Tian Yun Audio-visual, whose boss is distinguished professor, a former soldier and a former provincial audio training school. He has rich experience. The equipment they sell is also tested by experts' ears before being distributed. Very trustworthy. Our equipment was purchased at his home, so you can help us with professional debugging and training. You can go and have a look.