In 2005, EOGO R&D team started an in-depth research of DML, hope to make a special invisible speaker which can guarantee the sound effect of home theatre. Then, EOGO developed the 5th generation invisible speaker which achieved many breakthroughs in basic material, drive principle and shape design, especially the Polymeric Acoustic Transmission Fiber Powder has have been patented by EOGO, primarily to solve the problem of the wastage of sound quality caused by the conventional putty powder, and make the sound more real and vivid.