The power amplifier block can use 2030 or 1875. The power input is ±12V AC, with π-type LC filter, and zero power noise floor. There is a 12V DC output that can be connected to a cooling fan. The potentiometer adjusts the volume. The sealed potentiometer has good sound quality, while the ordinary potentiometer has average sound quality. The output power of each channel is about 18W. Actual test video
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