First you should go back to Good Guys and kick the installers in the nuts for just hooking up one voice coil.
Second find a good CEA rated amp between 600-800 watts @ either 1 or 4 Ohms. My personnal preference is Directed, Orion, Precision Power, Eclipse anything along those lines.
Warning: Shameless plug ahead.
I'm selling a Orion XTR Pro 1000 for $175 shipped to the lower 48 if your interested.
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