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
How To - AVH-210EX - Subwoofer settings - YouTube
Subwoofer settings | Alex Brown | Flickr
Subwoofer Crossover: Best Settings For Home Theater And Home Audio Systems - YouTube