Usually if you damage the woofer it will sound heavily distorted. It's very obvious if you listen for it.
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Gently, push the cone back to its end stop by putting pressure around the dust cap. If you do not hear a scraping sound then the voice coil is centered in the gap and all should be well. Most modern drivers are designed with short coil and long gap so that they can hit the end stop pretty hard without damage. It is usually the heat from prolonged overdriving that cooks woofers.
thanks! that all helps alot. viridian, i will try that, but i am unsure what the dust cap is exactly. rockvirgo, my sub has 2 eight inch woofers, one DOES make that crack, i have described it as a smacking. the other does not. therefor i ponder whethter one is dmged or not. i feel like it is bottoming out, but not sure. thanks again all.