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Message: <blockquote data-quote="keep_hope_alive" data-source="post: 8521993" data-attributes="member: 576029">i agree to testing with a portable music player (or phone) to bypass the head unit and just test the amp.the amp shouldn't have an HPF setting for the crossover but make sure it's set to LPF and around 80Hz.also, you need to verify the coils aren't out of phase.  if they are, the subs won't move.  it can be an easy mistake to reverse phase.  pay careful attention to how they are wired, and hopefully you are using speaker wire that is color coded.  course, testing the wires with a 9V battery will certainly cause them to move if they are wired correctly.i've also seen issues with the box terminal connections melting or coming loose.it's also possible the amp is no longer functioning.</blockquote>

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