Audio brand in 1991 registered in the United States, in 2000 to enter the Chinese market, initially only for the entertainment industry friends to do the application of investment projects. After the registration in China in 2003 is still only small minority of the circle of engineering services. Launched in 2009 for the Chinese market KTV's three-frequency speakers after the official promotion. Chinese transliteration for "Sida sound", meaning "think enlightenment" means. Sida sound design team is a group of love of music art, keen on acoustic theory and application of technology research to explore the old, middle and green three combined team. The soul of Mr. David and Mr. Huang Qingcong have been the band guitarist. And have a deep electronic electro-acoustic technology foundation. Mr. David in the late eighties devoted himself to acoustics theory and technology research, participated in the famous American audio research and development, design and production. In 1991, Mr. David founded the Acoustics Materials and Technology Research Laboratory in California, USA, and began working with professionals interested in the Chinese mainland. Mr. Huang Qingcong, one of the founders of the company, has been working in the entertainment and audio industry since the 1980s, where he has worked as a band guitarist, DJ, tuner, artistic director, performing arts planning broker and audio system application design and development engineer. , On the development of China's entertainment industry and audio industry has a profound experience and understanding, has presided over the planning and operation of a number of successful large-scale and representative of the entertainment planning, opening and operation, sound system design and application And entertainment management planning investment experience is very rich.