[Reece]

Before you give up on that speaker: get some fabric glue from a ...fabric store! This looks like ordinary white glue but remains somewhat flexible after drying, and becomes at that time waterproof, although it is soluble in water out of the bottle. Squirt some in a container and thin with a little water, enough that it is brushable but still thick. Brush it on the speaker cone all over, outer surround also, use it to reglue down your repairs, too. Keep it out of the voice coil, of course. Leave the speaker facing upwards to dry overnight. I have had speakers with deteriorating cones where there were myriad little cuts and tears invisible unless you pushed on the paper, and that rattled in operation, become cured with this treatment.