What is a good crossover frequency for a subwoofer? - Quora
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
If a woofer has a frequency range as low as 60HZ, what would the actual frequency response be for the lowest frequency? : r/audiophile