I would upgrade the caps and get a new pair of drivers. The DIY audio forum will have all the info youll need.
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Generally, these speakers are only worth a little bit of work.
If they get at all expensive, it will be much better to start a brand new DIY kit from scratch.
One thing particularly difficult for noobs is finding a woofer that matches the cabinet, and then adjusting the crossover for it. It's a lot lot harder than you think it is and not really worth it. It's like the tail wagging the dog kind of situation.