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The sound quality is very good using the digital power amplifier module. TPA3118 PBTL Mono digital audio amplifier chip, digital power amplifier module. The mono digital audio amplifier chip features high output and low power consumption. The power amplifier module is applicable with speaker impedance: 4-8 ohms (8 ohms is the best). PBTL mono 60w digital power amplifier board. PCB board size: about 45*35mm/1.77*1.4in.