HX 300 D 12 inch 1200w subwoofer - Hertz Car Audio
The Five Cs of Subwoofer Setup | Wirecutter
Hertz ES F25.5 10" Shallow Mount Subwoofer - Audio Boffins Ltd
What are the frequency settings for a subwoofer? I have a subwoofer with 4 different frequency settings. I need powerful, punchy bass. Should the setting be positive or negative? - Quora