So, I have planned to get "HDS3.112 Subwoofer"
( SoundQubed HDS3.112 )
with
"SQ-12LSVDD 12" Soundqubed Single Vented SPL Box"
( https://www.atrendusa.com/soundqubed-12-soundqubed-single-vented-spl )
pairing with
"AudioPipe APCL15001D High Power Mono 1500 Watt Max Class D Car Amplifier"
(...