Sound proofing technologies are getting more attention to the environmental application as well as safety measure. Among various new materials, textile sound absorbents including nanofibers and melt-blown microfibers are very strong candidate for this application, and are getting more and more popular on the comercial market as noise reduction material. In this study, sound absorption characteristics of these new textile materials are analyzed by investigating the acoustic characteristics of nanofibers, melt-blown microfibers, and their webs. Impedance tube method is utilized to measure the sound absorption coefficients of mono and multiple layers of the webs and compared those with melt-blown microfiber
materials in the function of fabric aerial weight. The test results showed that the sound absorption coefficients of nanofiber layers were superior that of microfiber fabrics in the frequency range below 1000 Hz. However, hybrid composition with nanofiber layer and micro fiber layer shows detrimental effect, thus lowering of absorption coefficient, especially in the 2000~4000 Hz region. Also, the sound absorption of nanofiber webs improved with numbers of layers.