My new subwoofer just stopped working!?

I got new subs. The second day i was using them they just stopped working midway thru a song.. pulled the head unit out and checked all the wiring and all the wires were good. I checked the wires on the subs and to the amp, everything is normal... i dont know what happened?? any ideas
Update: I checked the fuses, the subs are in polarity, and the amp is grounded well and isnt in protection mode.
Update 2: oh and i bought a new amp which did not help
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