Guangzhou DEMA Electronics and Sound Ltd was founded in 1989. It is sole owned by Australian. DEMA locates in Guangzhou China and has about 20,000 square meters space that equips with high tech facilities and equipments.  It is a professional audio manufacturer engaged in developing, designing, manufacturing, installing, technical support and after-sale services.
   GRF is the flagship product line of DEMA that will definitely guarantee you to have a great enjoyment of music.  After many years of intensive researches by its professional and experienced engineers, GRF is finally created and widely used for many applications, including stadiums and auditoriums, houses of worship, conference centre, retail businesses, department stores and restaurants in over 50 countries around the world.
    GRF is a high quality brand with unique designs. GRF speakers can produce stable, maximum power for long hours as well as maintain high performances, such as good frequency response, strong base, natural lifelike sound and etc. To maintain high quality, the specifications of the main components are adhered to international standards and DEMA's strict quality control system. All the speaker unit, speaker cabin, amplifier and have been designed by using 3D modelling and examined  thoroughly by using computing modelling system, high accuracy test equipments under extreme conditions. GRF is a complete mature production line.
   DEMA-GRF fully meets the standard requirements of ISO 9001,CE,CB,CCC and ROHS as well as safety and environments, which is only the assurance to buy or use GRF products but also the awareness of DEMA to environment for the sake of community benefits.
   GRF line provides a wide range of products. It is very easy to compose a unique sound solution to meet virtually any audio challenge in any application. GRF has a proven record of excellences in design and also has achieved outstanding reputation among our customers in quality, trust and value for more than a decade.