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
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1 Set Amplifier Board Subwoofer Adjustment Bluetooth-compatible 4.2 Fm Radio With Power-on Indicator 220 V Microphone Support Digital Amplifier Board | Fruugo NO
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