This product features a DC single power supply of 9-24V and utilizes the TPA3116D2 high-performance digital power amplifier chip as the core component. It supports parallel bridge connection and bass channel power amplification, capable of delivering up to 100W output on the bass channel. It includes an external audio source input interface with pre-amplification and bass crossover processing. Equipped with adjustable controls for bass volume, bass frequency, switch/master volume, and two adjustment potentiometers for customized sound tuning. The device operates on a wide DC 9-24V voltage range and features a power-saving design with efficiency exceeding 90%. Compatible with various power sources such as high-performance switching power supplies, laptop adapters, portable power banks, or car power systems. The board is a fully assembled and tested unit. Simply connect the speaker according to the provided diagram, attach the appropriate power supply, and link the audio source input to begin operation. Note: Depending on the production batch, the electronic components on the amplifier board may vary slightly in appearance from the images shown, but functionality remains unchanged and performance is unaffected. Material: PCB + electronic components + metal Color: Black Package Contents: 1 x Amplifier Board 1 x Set of accessories (accessory colors are random and cannot be selected) The package includes only the items listed above; other products are not included. Note: Lighting conditions and monitor settings may cause slight variations in the color representation between the image and the actual item. Measurement error allowance is +/- 1-3 cm.