sub amp not working

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hi i have a Jensen DX 260 powered subwoofer,
i went to use it the other day and it is not working!!
if you turn it right up, u can just hear it, it is really quiet.
i have taken it to get fixed but they did not look at it because they could not get a wiring diagram.
does anyone know what could be wrong with it?
or where i could get the wiring diagram?
thanx
 
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