Subwoofer setup and integration 101: sub crossover frequency, slope an - Acoustic Frontiers LLC
1 PCS 300W Subwoofer 1-Way Audio Crossover Filter Super Frequency Divider | eBay
Crossovers: How They Work and How to Choose Them - Audiofrog
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 Set a Good Crossover Frequency for Speakers