so the other day my sub just stopped working. it worked for 6 months. there is power going through the amp and everything is wired correctly. i plugged in my friends sub and it worked perfectly fine. what can be wrong?

before it stopped working my sub would work for about 3 seconds the stop for 3 seconds then turn back on and do the same thing over.

this every happen to anyone. please help i need BASS!

 

Burnt out voice coils.

 

Or possibly a poor speaker wire connection to the sub, [inside the box]. 94