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Horn loudspeakers are still widely used in some markets in rural and urban areas. Once the sound film of the loudspeaker is lost, a method is introduced below to ensure the correct installation of the sound film. Easy to solve this problem. Installation can be done in two steps. The first step, select appropriate thickness of paper, cut two loose 10 mm. A piece of paper 20 mm in length larger than the diameter of the center piece. Then the two strips are placed perpendicular to each other on the center piece (the position should be removed in order to prevent them from moving.). Stick them with a little paste. Insert the two ends of the note into the magnetic gap. Align the sound coil on the sound film against the magnetic gap and gently press it down. Due to the existence of the note, the sound coil is located in the middle of the magnetic gap. Test the edge of the sound film and apply the universal glue to the edge of the sound film, and cover the top cover of the sound head. Tighten the screw on the positive screw hole. Remember the position of the top cover with the head in place for 8 hours. When the universal glue is completely dry, you can unscrew the screw and remove the upper cover. By this time, the sound film has been glued to the upper cover. The second step is to weld the lead wire to the wire post. Take off the two pieces of paper, then take the cover back and focus your attention on the original mark. A multimeter R × block or 1.5V dry battery can be used at this time. While touching the two connecting posts and making a "tap" sound, tap the top cover to the maximum sound, and when there is no friction sound, you can gradually tighten the fixed screw. When the screw is screwed. Rotate and tighten instead of tightening one screw until the second screw is tightened.