• Ok, I presume U are saying the "Cone" of the Sub when powered up only moves "UP" which is what would happen if wired to "D.C.", not "Audio" which is like "A.C." going both up & down. John
  • Sounds like the amp has shorted output transistors which will send high DC voltage to the subs voice coils. Replace the amp and have the subs checked because if the bad amp did send voltage to the coils then it may have burnt the subwoofers as well.

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