What is a $500- $700 power cord for subwoofer

Looking to bring out more hard hitting low end power.

What power cords brought more depth and powerful bass extension to your subwoofer?

I'm looking for power cords for a HSU vtf2 mk2 and earthquake supernova mkIV subwoofers.

I'm currently using the stock power cords. Closer to $500 is better.

Thanks