The production process of Yadina tuning is made from compressed sponge with high temperature and pressure, which can be compressed into compression foam of various compression ratios according to the use and actual requirements. Different compression ratios have different tuning effects, but also affect the sound quality. The application of yardena is widely used, mainly used in electronic and loudspeaker industries, and has the effect of adjusting the tape-avoidance tone, damping and removing noise. Mainly divided into: headphone tuning cotton, cell phone tuning cotton, cell phone muffled cotton, loudspeaker tuning cotton and so on. Our company also offers customized services. The yardena tuning cotton is based on the frequency of the audio frequency and different materials, different proportions of the special foam cotton. More stable sound quality than the non-woven fabric. Use the yardena toner product to be more upscale. It is the most commonly used muffled cotton in high-end mobile phones. It is commonly used to use 5-7 times the thickness of 0.75-1mm thickness as the silt of the speaker and receiver.