Get a cardboard tube from a kitchen or toilet roll, put your mouth around it, place it over your speaker cone and suck. This may take a while.
Get a piece of sellotape and stick it over the speaker cone using a pencil to lightly work the sellotape over the indented areas, pull as hard as you can from both ends of the tape. Again, this may take a while.
Get a vacuum cleaner and place it over your speaker cone, turn it on for one second and see if it worked. Set your vacuum cleaner to it's lowest suction setting and gradually increase the suction. This may take a while.
Insert a paper clip into the cone and bend it so you can push the cone back out, then cover the hole with some nail varnish or paint.
You're done! Your speaker cone should now be unpopped and ready to use.
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