sub makes a popping noise help

[10W3dodge96 10+ year member]

My si bm makes a popping noise but its never made this noise before. Ca you please help me. I just put it into a new car and it just started making this noise.//content.invisioncic.com/y282845/emoticons/verymad.gif.3f39c5c2fd57527b671fad3efdfac756.gif:verymad://content.invisioncic.com/y282845/emoticons/verymad.gif.3f39c5c2fd57527b671fad3efdfac756.gif:verymad://content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gif

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[cashflow101 10+ year member]

bad ground?