I believe but don't quote me is because they are dual voice coil? I'm not a wiring expert -

I would like to replace the factory subs with 2 better ones of nicer material but haven't found anything yet that would work and I don't want to cut up wiring or get a new amp etc

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2018 Ram 2500 6.7L Cummins 68RFE
19k miles -Bright White/Black - Big Horn Sport - Crew Cab Short Bed
2013 X5 35D (CEO's) - Born on 5/17/2013 -
82k miles - Alpine White/Cinnamon Brown/Premium Pkg, Sport Activity/Premium Pkg and Sound/20" Style 214/Running Boards