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
The Five Cs of Subwoofer Setup | Wirecutter
Understanding Subwoofer Controls or What Do All Those Things Do, Anyway? - Blog | Axiom Audio | Axiom Audio
The Five Cs of Subwoofer Setup | Wirecutter
WEON True Bass Subwoofer Pre/Low-Pass-Filter Board for True Bass Output | Only Soft Low bass Frequencies | Cuts Vocal & Treble Sounds | in Built Gain Adjustment : Amazon.in: Electronics