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well, as a past audio sales manager--i may help. what you hear could be a couple things---1st a 'blown' 'voice-coil'---i say this as 'woofers', let alone 'sub-woofers' handle the lowest 'boom boom' frequencies'---and They use more power than an army of 'tweeters'---so get hot, voice-coil distorts, 'crossover' electrics may fail---even the foam surounding the speaker could cause what you hear, unlikely---'blown voice-coil' gets my vote--
remedy? you don't fix a voice-coil---ya bury it---best look for an Alpine, Pioneer, JBL speaker---something with a whoppin power-handling spec. and that's 'true rms' power---not some BS 'music-power', etc., as dealers site.
and a word on 'sub-woofers'---'woofers', good ones, produce audio response to the bottom of human hearing---what more does one need? sub-woofers eat power like crazy producing, i feel, superfluous low-freqencies, you may feel but can't hear---they can hurt your car---i often hear 'boom-booms' go by, and the entire vehicle is 'rattling'---future trouble---not to mention ear-damage---for real---
best look for as mentioned above---no worries on your power-amp, yet---if it could waste a sub-woofer V/C? ya got plenty---and try 'turning volume down'? if ya find a good R&R, and it's still 'breaking-up'? then think of your amp---as speakers, low-frequencies 'push-the envelope' of any audio system---that does include the amp----at home, or driving---good luck---
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