What is the best way to wire my car audio system?

Here’s my deal: I have an Alpine amplifier leading into a sub, also Alpine. The amp is an Alpine MRP-M500. The sub is an Alpine SWS-12D4. Now I know that with the dual voice coil, there are two possible ways to wire it, in series and in parallel. I also know that parallel wiring causes the load to drop to 2 ohms and the wattage to rise. I currently have the system set up to run from the amp to the sub’s dual voice coils in series and it sounds great, but I’m a little concerned about damaging my system. I am also curious as to whether or not it can sound even better. Is there something I can do to boost the system or did I mismatch the two? If I made a mistake, what should I look into, within the same price ranges?

Rewire the voice coils to present a 2 ohm load to the amplifier. It’s more than capable of handling a 2 ohm load and will deliver the full 500 watts RMS it’s capable of opposed to the ~200 watts you’re currently getting out of it with the voice coils wired in series.

AAMOF, there are some concerns of monoblock amplifiers not operating properly at loads higher than 4 ohms. I’ve never seen any proof of it, but regardless it’s not helping anything, especially in your situation.