This research compares results of an experimental on the drying by method of convection and microwave of oil palm boards(OPB) from Chumphon in Thailand, focusing on the sound absorption, Physical test and Mechanical Properties relationships between moisture content and time. OPB was processed into in with dimension of 300 mm × 300 mm, 20 mm (thickness).The test conditions were examined under different treatment method of drying and temperatures. As a result, noise reduction coefficient for convection drying at 50C 60C 80C and 100C was 0.4391, 0.4464,0.5239 and 0.5821 respectively the higher NRC value microwave drying. It is therefore, concluded that