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He needs to confirm that he has both B+ and remote turn-on voltage at the amp.
With your multimeter set to DC volts, the black meter lead on the ground terminal of the amp (not on the point where the ground wire connected to the vehicle) and the head unit on (so the amp will have remote voltage applied), touch the red lead alternately to the B+ and remote terminals of the amp. If the voltage is below ~11 volts, you need to check the wiring feeding whichever line is too low.
Find your manual here:
http://www.maxxsonics.net/manuals/hifonics/
Next tell me the exact model number of your subs and type of box they're in
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