Can I repair speaker foam?

It depends on the quality of the speaker - check with polk. I went through my manufacturer and have had drivers re-coned a couple of times (simple procedure common in high end gear - studios, for example, damage speakers regularly, transport, dropped microphone, incorrect patch panel setting etc.).

For lower end stuff it is cheaper just to replace the entire driver or speaker as the drivers are not worth much and labor is costly.

I would not recommend you go through a third party unless they are approved by Polk. Neither would I recommend you mess with this yourself....the interface between cone and rubber/foam surround is a significant source of distortion in most drivers....best to get it done right or replace the driver altogether.

You can try a little tape on the back side, but I would bring it in to a shop and have them put a new surround on.

I can second Millersound.

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.