If the coil on the inside is looking ripped, it must be rubbing against the inner walls of the magnet. check of failure of continuity of the coil. if open and rubbing then you will need to replace the coil. I shall guide you through this job. carefully disconnect the coil lines to the frame, then using a good sharp tool remove the side suspension and the inner spider that suspends the coil. now you can remove the whole assmebly. if the coil is damaged then slowly cut out the coil, get a replacement of the same diameter from the spare parts shop. if not available you will need to have some experience to wind the coil in the same diameter with the same SWG. Once you get the coil fix it carrefully to the speaker diaphragm centrally, then centrally place into the speaker mountings with the coil just in the gap, not rubbing against the magnets. now you can glue out the spider and suspensions. there you are. Good luck .