The NS-03G is a sub power amplifier designed for passive subwoofers. It is not compatible with active/powered subwoofers or standard speakers. It features the TPA3116D2 chip and delivers 100W of power with a smooth volume control knob. The super mini size and solid shell make it easy to place on a desktop or subwoofer. It includes a 3.5mm AUX input for easy connection to various sound sources such as phones, CD players, and TVs. Note that a power supply is not included, and we recommend using our high quality 19V power supply (ASIN: B074J81XRB) or a power supply of your choice with at least 4A of power. We recommend choosing a good quality power supply with a range of 12~24V.