more than likely it was caused by moisture as stated above, especially since you are putting a small amount of power into them. Its important to provide some level of moisture protection to a speaker installed in a door... They WILL get wet at some point.
I have formed baffles using dynamat on vehicles with odd/limited woofer space in the past. Very easy to do, and worth the minimal effort.
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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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