Can I repair speaker foam?

Go on eBay under Polk and buy the refoaming kit. I did it myself so I am sure you can do it as well. It just takes some time and effort. Good luck.

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.

Refoaming a speaker is easy.
Just make certain the cone is centered and it is a snap.
Total klutzs need to have someone else do it.

First find out how much is the whole driver or speaker.
Maybe it's not worth to put effort towards there man!

Replacing the speaker instead of refoaming is usually a bad idea.
The new speaker has (unless identical from the same manufacturer with the same parameters) will have a different sound.
Every speaker has various parameters for impedence, proper enclosure size, rolloff..etc. no two different brand, model speakers are anywhere near the same!
Teh more I look at speakers and the idea of building my own it is really really hard to do. replacing a speaker in a loudspeaker cabinet is more than just getting the right size to fit the opening!
Replace the foam....