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
SETTING LPF SETTING ON YOUR AMPLIFIER AND HEAD UNIT - YouTube
Setting Low Pass and High Pass Filters in Kef Connect for LSX II and KC62 - KEF - Roon Labs Community
What Should I Set My Subwoofer Low Pass Filter To? - BoomSpeaker
What is a subwoofer, and do you need one? - SoundGuys