As others are getting at, the caps and resistors are just for filtering to cut highs from the woofer and powerful low frequency from the tweeters.
If they have foam surround they are probably dead. Once the foam and or the "spider" (centering the small end of the cone) distort then it's game over and they start buzzing or rubbing.
Have you tried them on any other sound source to make sure it's not an amp problem? You can also electrically separate and test each component (low volume or leave the cap on for the tweeter!) and see if any of the individual drivers are good.
Check out PartsExpress.com for replacement components; good to deal with. Eminence manufactures and also sells drivers. Mostly pro stuff but many suitable options for home equipment.
I personally just use speakers with cloth or paper surround as it will outlast foam.
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Today's Featured Article - Upgrading an Oliver Super 55 Electrical System - by Dennis Hawkins. My old Oliver Super 55 has been just sitting and rusting for several years now. I really hate to see a good tractor being treated that way, but not being able to start it without a 30 minute point filing ritual every time contributed to its demise. If it would just start when I turn the key, then I would use it more often. In addition to a bad case of old age, most of the tractor's original electrical system was simply too unreliable to keep. The main focus of this page is to show how I upgr
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