I can't remove the speaker

Removing the grill needs a picking tool..its like an ice pick that is bent at right angle..you should also protect the round stainless ring with a cloth or balsa wood since it is soft..very carefully pry off the grill at as many points around the circle so you don't dent the grill holes..the grill is held by some gummy or rubber like fasterner..good luck but do the job very slowly..or else Frankenstein Kardon..

Remove the protecting grill in front. Check if the cone is still connected to the rubber band. If not, remove the screws around the speaker. Open the casing itself. Do not forget the screw in the middle of the battery compartment. Remove the bottom cover. Disconnect the 2 wires on the speaker and take out the speaker. It will come out with the plastic protection around it. Looking at the cone now, push up the Carton cone and keep it in place by putting some tissue paper or small cloth underneath. Clean the cone first. Use some rubber cement on the outer edges of the cone and press the rubber back on the cone. Let it dry for an hour and then remove the tissue / cloth, so the cone goes back to its normal position.You can use some extra rubber (those pre-glued strips that you would use to fix a bicycle tire) to make it extra strong. Remount everything back in place and voila....it works again!If your cone is not damaged, the casing most probably does not seal good anymore. Tighten all screws a little more and use plastic electrical tape all around to seal all joints. The bass is produced inside the casing itself and pushed out via a horn. If it is not closed off well, your bass sounds grumpy.