100% polyester fiber is heat-treated by high-tech and made into a heat treatment public method to achieve density and ensure ventilation. It is an excellent product in sound absorbing and heat insulating materials. The highest acoustic absorption coefficient is 0.9 in the noise range of 125-4000 Hz. In the above, shorten and adjust the reverberation time according to different needs, remove sound impurities, improve the sound effect, and improve the clarity of the language. It is not only suitable for professional performing arts and audio-visual equipment testing rooms, but also widely used in theaters, conference rooms, indoor gymnasiums, concert halls, classrooms, KTV, hotels, offices, family music rooms, etc. .