Crossovers: How They Work and How to Choose Them - Audiofrog
What's the Correct Crossover Setting for My Sub? | Sound & Vision
Crossover settings for Tactile Transducer Bass Shaker and subwoofer | AVS Forum
Finding the Right Crossover Frequency for Your Subwoofer
How to Set Crossover and Gain on a Subwoofer - REL Acoustics
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