tufcote h 100psm u201d from aearo technologies llc indianapolis ind tc2303 a 1 06 inch 26 9 mm nonwoven acoustic insulating material obtained under the trade designation u201c thinsulate acoustic insulation tc2303 u201d from 3m company ma 4700 a 1 inch 25 4 mm nonwoven hydrophobic microfiber acoustical insulation mat obtained under the trade designation u201c thinsulate marine insulation ma4700 u201d from 3m company baffle assembly a a length of extruded semi circular 5 inch 127 mm radius 150 mil 3 81 mm acrylonitrile butadiene styrene abs extruded plastic was cut into six 24 inch 609 6 mm elongate baffles bifurcating the concave face of each baffle was a flange extending outward approximately 1 inch 25 4 mm baffles 1 6 were then cemented by means of an adhesive acrylic foam tape within a 24 5 by 32 0 by 15 5 inch 622 3 by 812 8 by 393 7 mm plywood frame according to the following orientation baffles 1 and 2 were positioned centrally within the frame with the collinearly opposed concave faces offset by 2 5 inches 63 5 mm baffles 3 and 4 were cemented convex face to convex face opposite their respective flange to baffles 1 and 2 respectively baffles 5 and 6 were positioned with the concave.