Subwoofer went out, very strange...please advise

[Brandox]

I have a Pioneer AVIC-D3 Head Unit powering a RF Multi Channel 1400 watt amp. The rear speakers and the subwoofer stopped working and upon inspection, was due to a faulty RCA adapter which was positioned too close to the air vent. The glue on the particular adapter had melted and fried the circuit. After replacing the adapter, the rear speakers are once again working, but the subwoofer is not. The subwoofer shows no damage on the inside or outside but does not produce any sound.

Any ideas?

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