Amp for my footwell sub?

JUCD VPR

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Belleville, IL. (St. Louis Area)
I want to buy another amp and power just my footwell sub.
I already have a Alpine MRD v12 but have no idea the wattage. i think its a 4 channel though? It powers my alpine head unit and focal component speakers.
I would like to buy the same brand and keep the saem look but don't know the power i need.
What kind of power should i get to push a 8" sub and make it sound/hit really well? 400x1? something like that or more? I have no knowledge when it comes to subwoofers. Any help is really appreciated.
 
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