just to keep everyone else informed about this problem should it happen to others, JC suggested I hook up the sub using speaker wire to eliminate the possibility of a jack issue. When I did that there was still no sound from the sub.

Axiom is now sending me a replacement amp for the sub. I'll be exchanging the amp and sending Axiom back the old one.

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Axiom M60, M2i, VP100, QS4, EP350v3
Yamaha RX-V1400