FI Q 12 problems

[alwaysontop 10+ year member]

i have an FI Q 12 with the BP power option

The other day i was just driving and it just stopped hitting.

thought it was the amp hooked up a different sub to the amp it started hitting and nothings wrong internally with the amp i checked.

the cone still moves freely up and down.

how else do i figure out what is wrong with it.

i dont know if i should send it in or not.

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