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 - More Memories of a Field Service Engineer - by Brian Dye. Introduction: The author worked for one of the largest Ford tractor dealerships in England as a trouble-shooter on tractor engines, hydraulics and combine harvesters from 1963 to 1972. In 1972 he became a dealer manager and finally left the dealer net in 1975 to run his own electronic design and manufacturing company. [Editor] We live right in the middle of Norfolk. The dealership that I worked for sold Fordson Tractors from the 1920's and some of t
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