Amplifer HELP!!!!

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I was wondering what wattage of amplifer I would need to get to power my 2, Memphis 15-PR124D subwoofers. They have 400 Watts Peak Power and 250 Watts RMS power, and They are 4ohm. I am confused about the difference between the different ohms also and what makes the difference between the different ones. If someone could help me out I would really appriacite it.
 
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