If your speaker needs reconing, you'll need to know the size of the cone.
A speaker consists of several different elements. What most people see when they look at a speaker is the cone. This is the round, cone-shaped structure that moves forward and back in the frame of the speaker to produce sound waves. The cone is suspended in position by a surround, made of foam or rubber, that allows it to move. If the cone of the speaker has become damaged, either by tearing, warping or other wear, it is often possible to replace it with a new cone. This process is called reconing, and one of the first steps in the process is to measure the old cone so a suitable replacement can be purchased.
Instructions
1. Loosen the screws on the perimeter of the speaker and remove the speaker from the cabinet. Unplug or pull off the wires connected to the rear of the speaker.
2. Remove the front gasket of the speaker. This is usually glued into position. Pry it or pull it off as necessary. Pull the speaker and the attached surround out of the speaker basket.
3. Pull the surround off of the speaker cone. This will be glued on. Use what force and tools are necessary to remove it.
4. Measure across the diameter of the speaker cone, from rim to rim. Don't follow the contour of the speaker cone, measure straight across to get the figure.
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