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 - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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