French GM audio from the development of raw materials, loudspeaker unit design and production, speaker design and production of everything can be controlled in their own hands. GM speakers have a wide range of services, including cinemas, large-scale sound engineering, large mobile performances, studio monitoring, band sound, as well as entertainment venues such as Disco, dance halls, karaoke, bars and other civilian aspects, from high-level fever sound, to the current popular family cinema comb...