CA-3316A 100W mono subwoofer digital amplifier board This is a DC single power supply 12-24V power supply, the use of TI's TPA3116D2 high-performance digital amplifier chip as the core, parallel bridge bass channel power amplifier, support 100W (bass channel) output. External audio input interface with preamplification, bass crossover processing; bass volume, bass frequency, switch/total volume, 2 adjustment potentiometers. Wide operating voltage, power-saving design, efficiency up to 90% or more. Can use good performance switching power supply, laptop switching power supply can also be used to rechargeable bottles, or car power supply and so on. The board is a finished board that has been welded and tested, connect the speaker box according to the diagram, connect the proper power supply, connect the audio input correctly, and you are ready to use.