PERZOE 1 Set Amplifier Board Subwoofer Adjustment Bluetooth-compatible 4.2 FM Radio with Power-on Indicator 220 V Microphone Support Digital Amplifier Board Car Accessory - Walmart.com
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 Setup a Subwoofer and Calibrate for Best-in-Class Bass | Audio Advice