Beijing Chang yinyou Technology development co.,Ltd(original Beijng Digital Audiovisual Technical Center),founded in the year of 1997.We have been pursuing preeminent quality and surpassing ourself with the concept of honesty,specialty,high-efficiency.Our company haveintegrated functional department,and with several authoritative experts of acoustooptocs and architectural acoustics,skilled professional technique engineers and a group of capable professional researching designers who have the senior technical post titles,which form the powerfull technical base of our company.Our company is designed to supply professional quality service as a product agent,saler,and designer,as well doing engineering design,installation,technique consultation,equipment maintenance and products tenacy etc.We mainly serve for variousestyles of indoor and outdoorudio and lights projects,public broadcasting and alarm system,professional karaoke song system,simultaneous interpretation,intelligent telephone conference system,large indoor and outdoor closed-circuit monitoring system,long-distance TV education multimedia system,holistic dimming performance production system,family intelligent audio system,building intelligent control integtated wiring system xxxxx now,we have done thousands of large and small engineering projects in many places all over the country,such as large multi-function hall,meeting room,auditorium,studio,large disco,bars,nightclub,intelligent residential community,piazza and outdoor park,etc.