not sure whats wrong with my sub

[TheBoss 10+ year member]

i have an older memphis model sub, a 12" high powered output speaker. i hooked it up the other day and it was bumpin a little bit at low volume(sounded normal) then when i go to turn it up some i hear almost a rattling noise so i turn the system off complete and put a dmm to it and read 3.33.. what do u guys think

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[loudcartunez 10+ year member]

u prob blew one of the coils