Thomas, welcome. It's unfortunate about the foul-up in communications, but it'll be resolved. As the replies of David and Randy have indicated, if the problem is simply that the line level input has been damaged, plugging into line out accomplishes the same thing. This is just a internal "Y" type of wiring arrangement and the leg of the Y that would feed the voltage out to another subwoofer amplifier works just as well in feeding the input voltage back into the sub to be input to its amplifier.

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Enjoy the music, not the equipment.