Ever asked her? You probably won't like the answer...

Rewired the sub to a 1 ohm load from a 4 ohm load, relocated the secondary battery, garbage binned the 8ga CCA that was running through the fender and replaced it with 1/0ga Tinned OFC to maximize the flow of current making sure to take a proper path trough the firewall this time.

Build is a Seismic Audio 10" SA-LAF102 wired to a 1 ohm load in a custom enclosure powered by a JP23v1.5

I build custom subwoofer enclosures focused on sound quality the way you want for a reasonable price, DM any of my social media profiles for information.