This project proposes to design amplifiers class a sadi subwoofer. By applying the basic theory of charot-testing gated devices power supply and amplifier circuitry, sadi class. To solve the problem of heat, weight, and size, the structure of the system design consists of a switching power supply, which serves as a regional power in the circuit. Class amplifier circuits, sadi, which serves to expand the audio signals. Wongchonkrong low-frequency audio signal through a filter, which functioned through a low frequency audio signal to a subwoofer. Wongchonkrong high-frequency band pass filter acting on high-frequency audio signal to pass through the speaker protection circuit Cape siangklang-which serves to protect the speaker cabinet fire straight into streams. Amplifier class multi-purpose sadi has been tested for performance. The finding is w. Frequency response, which contains the band's performance test results charot-testing gated devices power supply, which is 86 percent, Rectifier amplifiers there are 364 sadi class Watt Watt performance at 89.214 percent, and response 30 Hz-20000 or more frequency from the above test results the system design has been tested and can actually works according to the purpose.
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