Will this amp do?

[Guerra33]

If you only have one D4 sub you cannot wire it to 1ohm. So you would not have to worry about overpowering it at 2ohms with the AT 800,1

[awak333]

I showed her both the amplifiers and explained to her what I could, though most of it she doesn't understand. I'm going to start her with the RF Prime at 2 ohm 500 RMS. I think that will be a perfect match for the subwoofer as it is a little old too.

Thanks for everyone's input, it helped greatly! I will do a review on the RF Prime once we have it in.