12w7 amp sub ohm

Hello, I am purchasing a HO112R-W7 which is a JL 12" W7 sub in a ported box. Sub details/specs here: JL Audio HO112R-W7 Subwoofer system As you can see, the sub is 1,000 watts RMS and 2,000 watts peak @ 3 ohms. However, I want to use my old amplifier which is a JBL 660 watt 5 channel...