The RF looks good, but if the sub is rated at 700W at 4 OHM, wouldn't it be underpowering it?
How are these two?
MB Quart ONX1 2000D 2000W Onyx Series Class D Monoblock Power Car Amplifier Amp 806576219927 | eBay
MB Quart ONX2 100 400W Onyx Series 2 Channel Class A B Power Car Amplifier Amp...