Leads dig in from sitting the cone down into the spiders at high excursion. While it is disconcerning to see the marks, it isnt an issue. We have yet to have a single failure from the rubbing and the subs that have it simply play on with no changes to performance.
If you ever do have any issues with your sub, let me know... we stand behind them even though there isnt a warranty on the BTLs.
