i take it that you dont want to replace the damaged speaker or send it off for a refoam job,you can buy a product called (vulkem)that will repair the tear,vulkem is a polyurathene sealent that comes in a standard sized caulking tube & it can be bought at most professional glass shops that sell high performance sealents,if your local glass shop dont have vulkem then ask for (sikaflex 1a) which is also a butyl based sealent that dries flexible.
both products should cost less than a $5 spot & they both come in colors that will half ass match your surround.
both products should cost less than a $5 spot & they both come in colors that will half ass match your surround.