Dodgy speaker

[theprestige85]

So I dropped one of my rear speakers the other day while cleaning my room, and ever since it's got a crackling and deeply unpleasant distorted sound coming out of it. It's just that speaker, but it's unpleasant and now unplug it when I watch or play 5.1 material.

My system is an all in one Digitheater Pure Platinum. It's obvious to me that the speaker is damaged. So what shall I do? I admit, the system and speaker set is about a decade old, but they are pretty good quality for an older all in one system.

What should I do?