Well, first off Subwoofers do not have a "protection mode" it would be nice if they did.
It sounds to me like your taking your sub into its mechanical danger zone, at or near its utmost excursion point. I have seen subs that tore through the spider, and voice coils jumped out well past point of no return, to the point where they were hung up on the basket completely out of place. I have also seen them popped back into place, with spiders glued back onto cone, and played for years after. (this happened in a friends car, and we repaired it)
I would look to see if your spider may be torn, or your tinsel leads are torn where they come through the cone, making your rattling noise.
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P99rs Head Unit--- Amps- 2 Pioneer Prs800d --- Zapco ST1000MX---Zapco ST-4XSQ---- SI BM mk5 Subs---SI TM65v2 Midbass--- SI M3 mids--- SI M25 xbl2 tweeters ----- 2016 MECA street class 3rd place at world finals
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