Kapok fiber was one of the natural cellulosic fiber that can be found widely in Asia's forest especially in Indonesia. Kapok fiber was short and smooth surface causing poor interfiber cohesion that could not be processed in spinning. This fiber could be utilized to be accoustic sound proofing material. This research investigated about absorptive properties of non woven kapok fiber (SK) and its layered combination with tricot knitted fabric (TC) and double weave fabric (DWK). Combination of various kind of fabric's type improved thickness and air cavity that impact absorptive properties of fabric. Impedance tube were used to characterization sound absorptive properties at low until normal frequency on 100 until 5000 Hz. The optimum sound absorptive were showed by combination of non woven kapok fiber with double weave fabric with thicknes 11,25 mm. It shows thickness impact to air cavity and gave significant effect to sound absorptive properties.
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