HIFONICS HFX12D4 12" 800W Car Audio Subwoofer Sub

That’s a cheap sub, bruh. Reviews aren’t especially terrible, either.
https://www.amazon.com/HIFONICS-HFX12D4-800W-Audio-Subwoofer/dp/B0057Z1UXE/

I bought one just to keep in a closet as a backup in case my good one ever blows.