That’s a well designed audio power amplifier capable for delivering pure 300W on 4 Ohm speakers. The design is based on 6x LM3886 (High-Performance 68W Audio Power Amplifier chip). The main design concept uses two boards of 3 x LM3886 each one, bridged together. The amplifier is configured in push- pull topology so that total gain of the amplifier is doubled.
300W 6xLM3886 bridged-paralleled power amplifier [Link]
