Okay, Micah; the green light indicates that the sub amp is powering up, but apparently it's getting no input to amplify. Alan's report establishes that the sub was perfect when it left Axiom, but I wonder if the delivery in your area is exceptionally rough, even as those outfits go. As you've mentioned, check for loose internal connections.

Even if the connection from the line level input to the amp doesn't have any apparent problem, try inputting the signal with the speaker level inputs, as suggested before. To be continued(apparently).

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Enjoy the music, not the equipment.