10-01-2019, 07:04 PM
Today I tackled the speaker again. Using the cone which I bought, I cut a slit from the center toward the edge, stopping short of the outer web. I then very carefully put it into the speaker itself, the outer edge centered where it should be, and the center on the voice coil flange. Sadly, my previous efforts to make it work precluded mounting it to the voice coil, so I knew I would have to make an inner part for the cone, but at least I could get it to approximately the correct angle. By overlapping the inner edges of the cut, I was able to reduce the depth of the cone to where it would work. If I hadn't screwed it up earlier, I could have used it like that, just cutting the center hole to fit perfectly, but that was not the case. Anyway, I marked the cone to where it overlapped, then took it out, cut off some of the excess overlap, but leaving enough for a glue surface, applied goop rubber glue, and clamped it together with the proper overlap as I had marked it. When it had dried well, I cut along the outer edges of the innermost circular ridge of the cone, to leave a flat gluing surface. I measured the diameter of this circle, and of the flange on the voice coil. Using these measurements, I then took a piece of fairly thick sketch pad paper, and drew concentric circles several large enough so that I knew that even bent into a cone, they would properly cover the flange on the remaining new cone, and several inside that I knew would start too small for the voice coil and range to being a little too big. These circles were 1/8 inch in radius different between them. When this was done I cut out the circle, and cut out the center hole, and cut through the circle on a radius line. Using the speaker itself again. I bent the circle into a cone of the proper angle and depth, cutting away the outer edges one circle at a time until it fit right to the edge of the last ridge on the new speaker, and overlapped the remaining flat part I had left. I also cut the inner circles so that the center fit perfectly onto the voice coil flange, leaving the center open, but covering the flange there nicely. I marked the edge of the circle of paper and cut off the excess, then glued the edges together using my marked line so it was at a perfect angle. When the inner cone had set, I glued it to the remaining professional cone along the outside, and to the voice coil flange on the inside, hoping that everything would work. It did fit perfectly, and the gluing went smoothly. Then I let it set. A little while ago, I tested the speaker. It actually works very well, decent volume, and no rattles or other nasty sounds. SUCCESS ! Lastly, a few minutes ago, I sprayed the inside of the cone flat black so it will look fine if there is any "see through" with the original grill cloth of this radio, which is in very good condition, and which I do not plan on replacing.