This is a 400 Watt audio amplifier board based on the TI TAS5630B chip, designed for high-power single-channel audio amplification. It is suitable for subwoofers and various audio projects, repair, or modification of existing equipment. The amplifier features a power output of 400W at 3 Ohms, with a frequency response from 20Hz to 20kHz, and an efficiency of 95%. It offers low total harmonic distortion (THD) of 0.056% at 3 Ohms and 1W, and a signal-to-noise ratio of 94dB at 10W. The dimensions are 6 inches by 4.5 inches by 1.53 inches.