Now add glue dots to the horizontal piece and fold it downward, pressing it on top to secure.
15 Now we need to secure the flap on the left. Add glue dots along the edge of the non-printed side, and fold to line up with the edge of the box. Press down to adhere.
16 Next fold along each of the dotted lines on the horn piece. You are folding all of these inward.
17 Earlier we bent the horn piece backward to keep it out of the way while we folded the box. Now bend it forward, towards you.
18 We’re going to attach the right edge of the horn piece to the non-printed side of the tab. (Keep in mind that the fewer gaps you have, the louder the sound will be. So as you wrap the right side around the tab, take a look at the back, and adjust the paper to minimize the gap between the horn and the box.)
19 Now add glue dots along the inner edge of the left side, and fold to meet the center crease of the right side of the horn. Your paper amp is finished!