I would start with the obvious.....check your settings on your HU.
pull the sub out of the enclosure, and wire up a different speaker if you have one available, or test with a multimeter for voltage with the system turned on. if you have voltage, the sub is bad. if not, your problem is upstream somewhere.
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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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