Your subs are dual 4 ohm speakers. Meaning, they have 2 4ohm voice coils (think of it as 2 4ohm subs) You put both of them coils together, you can get either a 2 ohm or 8 ohm load. Since you have 4 4ohm coils, you can get either a 1 ohm, 4 ohm, or 16 ohm load. Since the amp is rated at 4-500WRMS at 4 ohms, so each sub would only be getting 200-250WRMS each. The amp is not one ohm stable, so that wouldn't work. And at a 16ohm load, you could barely hear the speakers.so what exactly is wrong with my set up......why is it not compatible