rapid thump coming through sub

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Ins0mn1aK
rapid thump coming through sub

I have a rapid thumping sound coming through my sub when i hook up power to the sub. my ground is fine and even when i take the rca cables out it does it. im figuring im going to have to send in my MTX THUNDER 600XD CLASS D MONO amp in. ive changed subs changed head units and dont have a spare amp to test. any ideas to save me from having to buy an expensive frikin amp for my JL W7 would be great.

 

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