1.LM3886TF, the biggest advantage of the chip is that it has the output anti-impact measures, so there is no need to use the horn relay delay, which is most suitable for subwoofer, because the strong vibration of the subwoofer is easy to make the relay contact jump.
2.TDA7294, also has the power on silence delay function, the final stage uses the field effect power tube output, so the chip has the taste of the machine.
3. Use the common commercially available \"fool block\" 1100. The circuit is simple, without a circuit board, the connection is also a field effect tube output, the effect is quite good